7 Best Trigonometry Online Courses and Classes - Make Your Pick [Updated April 2021]

Best Trigonometry Online Courses, Classes and Practical Lessons


Trigonometry is a tricky topic in mathematics. Some students find it very easy, while others struggle with it throughout. If you are in the latter category and wish to move to the former, you are in the right place. Here, we have found seven of the best courses that can help you learn everything that you need to know about trigonometry in detail. These courses have been shortlisted by TrumpLearning after a deep-research and consultation with some of the best math experts from around the world.


So, let us get started and take a look at them one by one. Hopefully, by the end of it, you will be able to find the best trigonometry online course for you.


7 Best Online Trigonometry Courses, Classes and Practical Lessons

  1. Become a Trigonometry & Precalculus Master - (Udemy)
  2. Trigonometry - The Unit Circle, Angles, & Right Triangles [Udemy]
  3. Pre Calculus, Calculus and Trigonometry - (Udemy)
  4. Algebra 2 & Trigonometry: A Complete High School Curriculum [Udemy]
  5. Dave's Short Trig Course [Clark University]
  6. Trigonometry [Khan Academy]
  7. Trigonometry Online Course [Thinkwell Homeschool]
Become a Trigonometry & Precalculus Master - (Udemy)


About the course 

Ranked at the top of our best online trigonometry classes is a course by Udemy. With a rating of 4.7, it is one of the top-selling courses on the internet.


In this online college trigonometry class, 302 lessons are included. This includes text and video-based explanations for everything from Trigonometry to Precalculus. Further, the course also has 89 quizzes with solutions. There are ten extra workbooks with additional practice problems. This can help you test the understanding of your knowledge along the way. So, by taking this course, you will become a Trigo and a pre-calculus master.


With every online college trigonometry class, you will get videos, notes, and quizzes. In the videos, you can see your tutor take every problem from the beginning. The course head will explain the problem setup and explain why this problem is set the way it is. He will then tell you about the steps taken to move ahead with the question, why these steps are taken, how to work through the fuzzy middle parts, and ideal ways to simplify the final answer.


Further, every section has a separate notes section wherein you will find the most vital things to remember. It will have the things you should know to score better in class, probably the things you already do not know.


As you progress through the trigonometry lessons online, you can take the quizzes, which can help you understand how well you are picking up. If you pass the quizzes, great. If you do not pass the quiz, you can revise and watch the video again or seek help in the Q&A section. Lastly, if you need more practice, you can review all that's taught in this best trigonometry online course by working through the bonus workbook. These workbooks have a lot of practice problems. So, this means you will have an excellent medium to solidify your learnings.  


The good thing about this online college trigonometry class is that it comes with lifetime access on both mobile and TV. So, you can rewind and review the resources anytime later as well. There is an option of friendly support, which can be availed from the question and answer section of the platform. Another valuable thing about this one of the best trigonometry online course is that you get a Udemy Certificate of Completion available for download after you are through with this course. The course also comes with a 30-day money-back guarantee. So, at any time, if you feel you did not get what you deserved, you can seek a refund.


What will you learn?

These are one of the best trigonometry lessons online because they have a lot for you to learn. Some of the things that this course can teach you are:


  1. Angles and their measurement, which includes the degrees, DMS, and radians.
  2. Understanding of the complex numbers, which includes De Moivre's theorem and polar forms.
  3. Six circular functions, including sine, cosine, tangent, cosecant, secant, and cotangent.
  4. Matrices, which includes Gauss-Jordan elimination, solving systems, inverses, and transformations.
  5. Different angles of the circle, including oriental arcs, sectors, linear velocity, and angular.
  6. Analytic geometry, which includes conic sections, such as hyperbolas, parabolas, ellipses, and circles.
  7. Graphing polar curves, which includes cardioids, roses, circles, lemniscates, and limacons
  8. The unit circle, that includes finding cosine and sine and learning to complete a triangle.
  9. Parametric curves, which includes sketching parametric curves and converting.
  10. Graphing of the Trigo functions, which includes sine and cosine graphs and transformations.
  11. The law of cosines and sines, including the Heron's formula.
  12. Graphing the trigonometric functions, which include cosine and sine graphs, and the transformations.
  13. Polar coordinates, which includes converting equations and coordinates.
  14. Inverse trigonometric functions and their graphing
  15. Trigonometric identities that include the even-odd, sum-difference, double-angle, half-angle, sum to the product, and product to sum identities.


What do you need?

For taking these trigonometry lessons online, there are a few prerequisites. Some of these have been listed below.


1. You must be thoroughly comfortable with Math and the vital fundamentals.

2. You should be comfortable with equation solving and basic algebra.

3. Knowledge of geometry is helpful, but it is not mandatory.


Who should take up this course?

This trigonometry online course can be a good start for:


  1. Current pre-calculus or trigonometry students or the students who are to start with them and are looking for help moving forward.
  2. Homeschool parents who need extra support for their children.
  3. Anyone interested in studying these concepts.


Reviews by Stacy Cochran

Although the concepts of this course were harder to grasp than any other math I have ever had, the instructor provided clear and concise explanations for them. I have been saying all along that if you can teach me advanced math, you truly have a gift. Well, you truly have a gift. Thank you so much for developing these courses.


Trigonometry - The Unit Circle, Angles, & Right Triangles [Udemy]


About the course 

Next in line for the online college trigonometry class is again an Udemy course, which has a rating of 4.7.


This online college trigonometry class comes with a 30-day money-back guarantee. So, if you do not quite like what comes your way, you can seek a refund. Further, the course comprises 19.5 hours of on-demand video, which is both informative and well-drafted. You get complete lifetime access to the course, and you can view it on your mobile and TV. Following the completion of the course, you will be rewarded with a certificate of completion.


What will you learn? 

On taking these trigonometry lessons online, you will have a lot to learn. You can be assured that you will have a thorough understanding of trigonometry by the end of this course if you have taken all the classes well and have solved the problems thoroughly.


This is the best trigonometry online course because it will teach you the following:

  1. Introduction to angles, which includes drawing in a standard position.
  2. Converting angles from degree to radians.
  3. Converting angles from radians to degrees.
  4. Calculating the angular speed.
  5. Determining the arc length.
  6. Finding the linear speed.
  7. Understanding and finding the reference angles and conterminal angles.
  8. The Unit Circle, and the six Trigo functions.
  9. Learning about the 30, 60, 90, 45-degree angles
  10. Assessing the precise value of the Trigo functions, sine, cosine, and tangent
  11. Pythagorean Theorem
  12. Angle of Depression Word Problems
  13. Right Triangle Trigonometry
  14. SOHCAHTOA theorem
  15. Angle of Elevation word problems
  16. Fundamental Pythagorean Identities with cosine and sine
  17. Even and Odd Trigonometric Functions
  18. Inverse Trigonometric Functions With Half Angle Identities and Double Angle Formulas
  19. Trigo functions of the angles, that is, using reference angles to know the exact value.
  20. Trigo functions and their signs in quadrants 1 to 4.
  21. Evaluating the Trigo functions of the quadrantal angles
  22. Graphing cosine and sine functions
  23. Identifying the period, amplitude, vertical shift, and phase shift


You can check out Udemy's trigonometry online course that we have linked here to read more about what this course will teach you.


What do you need?

For taking these trigonometry lessons online, you will require a basic understanding of geometry and algebra.


Who should take this course?

This online college trigonometry class is perfect for college and high school students who are learning Trigo and need help with their homework or need to pass a trigonometry test.


Reviews by Mohammed

I was very impressed to go through his course. Well explained and especially plenty of example to illustrate the concept. I wish - he has geometry course and calculus course.


Pre Calculus, Calculus and Trigonometry - (Udemy)


About the course 

Taking our list of best online trigonometry classes forward, we again have a Udemy course with a rating of 4.5. It is one of the bestseller courses and has a lot for you to learn.


Pre-Calculus, Calculus, and Trigonometry are all difficult topics in math. Calculus is the math of change as everything in the world is continually changing, and calculus can help us track these changes. It is used in several different modern era fields, such as animation, statistics, game designing, computer science, mathematical research, probability, and a lot of other things.


Trigonometry entails measuring the angles and the sides of a triangle. It is used in several different fields, including flight engineering, video game designing, construction, a satellite navigation system, astronomy, oceanography, and other things. The calculus know-how helps you give a better base to learning calculus and is a good start before moving on to the study of calculus.


Regardless of whether you have studied this before or are starting it anew, these are the three most complicated topics and need an in-depth understanding. So, if you are finding difficulty with these three, this can be the best trigonometry online course for you.


This course covers all the vital things you need to know about trigonometry, calculus, and pre-calculus. Over 1200 students based in 130 countries have taken and reviewed this course. It has more than 9 hours of video content and five resource articles. The good thing about these trigonometry lessons online is that you get lifetime access to all the resources. You can go back and review the class anytime there is confusion. If you complete this course, you will be rewarded with a shareable certificate of completion. You also get a 30-day moneyback guarantee with this course.


What will you learn?

Apart from teaching you pre-calculus & calculus in detail, some of the things that these online trigonometry classes will teach you in the field of trigonometry have been listed below:



  1. You will learn the correct way to define the different Trigo functions, including sin, cos, and tan, and finding them for the given right-angled triangle.
  2. You will learn about the Trigo identities, such as the complementary angle identities, Pythagorean identities, negative angle identities, sum and difference of angles formulas, sum to product formulas, product to sum formulas and apply these Trigo identities into solving a problem.
  3. There will be a section wherein you learn to define the triangles, the types of triangles, and cite the examples of the different types of triangles.
  4. You will learn the correct way to define the different Trigo functions, including cosec, sec, and cot, and finding them for the given right-angled triangle.
  5. You will learn to define the complementary angles and the right way of finding these angles of the given angle.
  6. You will learn about the Pythagoras Theorem and solve the right-angled problems based on this theorem.
  7. You will learn to define the Trigo functions of the standard Trigo angles, that is, 0 degrees, 30 degrees, 45 degrees, 60 degrees, and 9- degree.
  8. You will be taught the triangles' different properties and solve questions based on triangle properties.
  9. You will learn the simplistic way to find the Trigo function values of the non-standard angles, such as the 22.5 degrees, 75 degrees, and alike, by way of Trigo identities.
  10. You will learn to define similar triangles.
  11. You will learn to define the laws of cosines and sines and use them to find the unknown angle and side of a given triangle.
  12. You will learn to define the conditions for the similarity of two triangles.
  13. You will learn to prove the similarities in two triangles.
  14. You will learn to define a similar triangle's properties and solve them to find the unknown angle and sides of a similar triangle.



What do you need?

These are the best online trigonometry classes because there are no prerequisites needed to take this course. You can start with only a basic background of math and some willingness to learn.


 Who should take this course?

This is the best trigonometry online course for:


  1. Working professionals
  2. Engineering majors
  3. Math Majors
  4. Anybody interested in learning functions, Trigo, and calculus


Reviews by Ahamed Tanjil

Probably is the best course I have taken so far, He explains everything in detail using practical life examples. This is a MUST buy.


Algebra 2 & Trigonometry: A Complete High School Curriculum [Udemy]


About the course

Next in line for the best online trigonometry classes that you can take up to refresh your Trigonometry knowledge is again a course by Udemy. It has a rating of 4.6 and is indeed one of the most popular online trigonometry classes on the internet.


These online trigonometry classes come with a 30-day money-back guarantee. So, in this one month, if you do not like what's been taught, you can get a full refund back. The course comprises 16 hours of on-demand video and one hundred and eighty-three resources, and you get full lifetime access to this and all the other resources. You can watch the course on your phone and TV, and upon completion, you will be rewarded with a certificate of completion.


It is a very well planned and drafted trigonometry online course, wherein the complete Algebra 2 curriculum is covered. So, through these online trigonometry classes, your teacher will try to incorporate all the aspects of traditional algebra two. There are also two units on basic trigonometry to ensure that your basics are clear.


Seventeen units will be covered in this online college trigonometry class. These are listed, in order, below, and these are all the Algebra two topics.

  1. Introduction to Matrices
  2. Transformations of Matrices
  3. Determinants and Inverse Matrices 
  4. Absolute Value and Inequalities
  5. Introduction to Functions
  6. Linear Functions
  7. Systems of Equations and Inequalities
  8. Polynomials
  9. Dividing and Factoring Polynomials
  10. Radical Expressions
  11. Quadratic Functions
  12. Special Functions
  13. Logarithms
  14. Polynomial Functions
  15. Trigonometric Functions
  16. The Unit Circle and Angle Measures
  17. Combinatorics


What will you learn? 

In this online college trigonometry class, there is quite a lot for you to learn. A few of the things that these trigonometry lessons online will teach you are:


  1. Identifying the functions with the use of the vertical line test.
  2. Solving the absolute value equations, and the inequalities
  3. Addition, subtraction, and multiplication in matrices.
  4. Finding the inverse of matrices and using the inverse of the matrices to solve the encrypted messages.
  5. Graph and linear functions.
  6. Solving the systems of equations and inequalities.
  7. Using the test points for finding the boundaries of the linear equations.
  8. Identifying and describing the polynomials.
  9. Dividing the polynomials via the use of a long division.
  10. Identifying and FOIL complex numbers.
  11. Factor polynomials.
  12. Plotting basic radian measures on the unit circle.
  13. Converting from degrees to angle measure.
  14. Graph quadratic, square root, cubic, and exponential functions.
  15. Using Descartes' Law to identify negative, positive, and the imaginary roots of polynomial functions
  16. Solving the basic Trigo function problems involving sine, cosine, tangent, cosecant, secant, and cotangent.


 What do you need?

For taking these online trigonometry classes, you will require the following:


  1. Firstly, you need to have access to the internet.
  2. Second, you need speakers or headphones for hearing the audio.
  3. Lastly, students will also require a PDF viewer, a printer for viewing and printing the supporting materials.


Who should take this course?

These are the best online trigonometry classes for:

  1. Students who have already taken Algebra 1 and/or Geometry course.
  2. Algebra 2 teachers who would want the supplemental material can also take up this trigonometry online course
  3. Adult education students who are studying or preparing for the HSE or GED or HiSET or TASC will also benefit from this trigonometry online course.


Reviews by Lucas Tchelikidi

This course has been really good so far. I think the teacher teaches very well and I understand the concepts quite decently, and the review we do helps quite a bit. However, I wish that he would explain why the techniques we use work because I feel like I could understand them more if he were to do that.


Dave's Short Trig Course [Clark University]


About the course 

At number five in our list of best online trigonometry classes is a course which is offered by Clark University.


Trigonometry is incredibly useful. Through this trigonometry online course, you will learn a bit about it. However, before you book this course for you, we would like to clarify that this can be your notes and not a full-blown course. It is more like an introduction or a guide. If you need full trigonometry lessons online, you can try out the others on the list.


In these trigonometry lessons online, there will be no tests and no grades. There are no awards and no transcripts, either. You will get a few exercises, but they are few and can give you good practice. Since we believe that exercises are instrumental in gauging your understanding of the course, this trigonometry online course can help you.


This a free trigonometry online course and will undoubtedly give you an introduction to this aspect of Trigo. So, go ahead, visit their website, and you will get an in-depth insight on all that this course holds for you.


What do you need?

For taking this trigonometry online course, you should be familiar with geometry and algebra. With the knowledge of algebra, you will be comfortable at manipulating algebraic equations and solving equations. From geometry, you will know about similar triangles, the Pythagorean theorem, and many other things, which will be used in Trigonometry.


Trigonometry [Khan Academy]


About the course 

The next course in our selection of best trigonometry online courses is a course that will help you earn 3,300 Mastery points. So, this course is divided into four sections, and each of these sections has two parts. Part one is the course's theoretical learning, and then the next part two is the question bank or the set of practice questions that will help you ascertain how well you have understood the contents of this trigonometry online course.


What will you learn?

Section 1 – 700 Mastery Points

Right triangles & trigonometry


It comprises:

  1. Ratios in right triangles
  2. Finding the side of a right angled triangle using the trigonometric ratios
  3. Introduction to the trigonometric ratios
  4. Using trigonometric ratios to calculate an angle in a right triangle
  5. Modeling with right triangles
  6. Sine and cosine of complementary angles
  7. The reciprocal trigonometric ratios


Section 2 – 300 Mastery Points

Non-right triangles & trigonometry


It comprises:

  1. Law of sines
  2. Law of cosines
  3. Solving general triangles



Section 3 – 1700 Mastery Points

Unit circle introduction


It comprises:

  1. Radians
  2. The Pythagorean identity
  3. Trigonometric values of special angles
  4. Graphs of sin(x), cos(x), and tan(x
  5. Amplitude, midline, and period
  6. Transforming sinusoidal graphs
  7. Graphing sinusoidal functions
  8. Sinusoidal models
  9. Long live Tau


Section 4 - 1700 Mastery points

Trigonometric equations and identities


It comprises: 

  1. Inverse trigonometric functions
  2. Sinusoidal equations
  3. Sinusoidal models
  4. Trigonometric identities
  5. Angle addition identities
  6. Using trigonometric identities
  7. Challenging trigonometry problems


Trigonometry Online Course [Thinkwell Homeschool]


About the course 

Next is the Thinkwell's Trigonometry with Professor Edward Burger trigonometry online course. It is a homeschool course and has several engaging trigonometry lessons online, which have step-by-step exercises that teach you everything you need to succeed in your calculus test.


In the curriculum, you will learn about the trig functions, identities, ratios, and more. So, you can enroll in this online college trigonometry class. Instead of learning all that is required traditionally by reading through the textbook, you can watch easy-to-understand trigonometry videos to get a better grip over the subject. 


This trigonometry online course is conducted by Edward Burger, an award-winning math teacher, who explains and demonstrates the trig functions clearly to the viewers. So, taking this class, all the basics will be easy to understand and comprehend for you. More so, your professor will also share some tips and tricks with you so that you can remember them as you move forward with calculus.


You also get a workbook for practice with this online college trigonometry class. It is optional and comes with sample problems, notes, and some exercises that can be downloaded and printed to study even when you are aware of the computer. Also, please know that these online trigonometry classes come with a 14-day risk-free money-back guarantee. If you feel that you have not received what you were seeking during this period, you can request your money back. 



Bottom Line

So, according to us these are the top seven best online trigonometry classes that you can check-out. These are detailed courses, which can be quite helpful to get a better mastery over one of the most challenging math concepts. For your clearer accessibility, we have marked the links to these online trigonometry classes. You can click on the links and read more about the courses before making a decision. If these courses don't cut ice with you and you want a personalised tutor, then Fine Grades trigonometry tutors are a good bet.


Best Trigonometry Online Courses and Classes Reviewed by 10 Math Experts 4.6
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