Ch 37: Praxis Mathematics: Trigonometry

About This Chapter

Trigonometry is a complicated subject with many subtopics. Study trigonometry by watching our video lessons and refresh your knowledge before you take the Praxis Math exam. You can assess your progress with quizzes.

Praxis Mathematics: Trigonometry - Chapter Summary

By watching the video lessons in the Trigonometry chapter, you can update and refresh your knowledge of trigonometry concepts. You'll need to know about these theorems for the Praxis Mathematics: Content Knowledge exam. In the Trigonometry chapter, you'll learn about topics including:

  • Converting between radians and degrees
  • Finding the asymptotes in trigonometric functions
  • How to solve trigonometric equations for x
  • Identifying phase displacements in trigonometric functions
  • Introduction to cosecants, secants, and cotangents
  • Introduction to sines, cosines, and tangents
  • List of the basic trig identities
  • Practice applying the law of the sines and the law of the cosines
  • Practice finding the trigonometric ratios
  • Problem solving using the addition and subtraction formulas
  • Problem solving using trigonometric equations
  • Problem solving using trigonometric inequalities
  • Proving the trig identities
  • Sine and cosines of complementary angles
  • The addition and subtraction formulas for the sine, cosine, and tangent
  • The law of the cosines
  • The law of the sines
  • Trigonometric functions and amplitude
  • Trigonometric functions and periodicity
  • Trigonometric ratios and similarity
  • Trigonometry: sine and cosine
  • Using A = 1/2 ab sin C to find area
  • What is a trigonometric function?

Praxis Mathematics: Objectives

The Mathematics Content Knowledge exam is used to determine your readiness to be licensed as a secondary-level mathematics teacher. The exam tests your abilities and knowledge in mathematical connections, problem solving, reasoning and proof, representation, and use of technology. The Praxis Math test has 50 multiple-choice questions. About four questions, or approximately eight percent, of the exam covers trig.

The self-assessment quizzes that follow each video lesson help you check your understanding of the information you've learned as you go. Quizzes also help you get experience with the types of questions you find on the actual Praxis exam.

11 Lessons in Chapter 37: Praxis Mathematics: Trigonometry
Test your knowledge with a 30-question chapter practice test
Trigonometry: Sine and Cosine

1. Trigonometry: Sine and Cosine

Learn an easy trick to help you solve trigonometry problems, including problems with sine, cosine and inverse trig functions. At the end of this lesson, you'll know what SohCahToa means and how to use it.

List of the Basic Trig Identities

2. List of the Basic Trig Identities

There are specific trig functions that have very special and very simple relationships with each other. Learn the main one and how you can use it to understand the others.

Graphing Sine and Cosine

3. Graphing Sine and Cosine

Sine and cosine aren't just for triangles; they can also be waves. See them graphed on the unit circle and then learn how that translates into the sine and cosine waves.

Unit Circle: Memorizing the First Quadrant

4. Unit Circle: Memorizing the First Quadrant

Memorizing the unit circle can be a daunting task, but this lesson will show you a pattern to help you memorize the points, degree measures, and radian measures for the entire first quadrant.

Using Unit Circles to Relate Right Triangles to Sine & Cosine

5. Using Unit Circles to Relate Right Triangles to Sine & Cosine

The unit circle is a helpful tool for understanding trigonometric concepts. In this lesson, we'll look at right triangles on the unit circle to better grasp sine and cosine.

Converting Between Radians and Degrees

6. Converting Between Radians and Degrees

Angles can be measured in degrees or radians. This lesson will explore the difference and provide you with a simple calculation that can be used to convert degrees into radians and radians into degrees.

Law of Sines: Definition and Application

7. Law of Sines: Definition and Application

Don't get stuck trying to find missing sides or angles in a triangle. Use the Law of Sines to rescue you from any perilous triangle in which you have just a few pieces of information.

Law of Cosines: Definition and Application

8. Law of Cosines: Definition and Application

In this lesson, we'll learn how to solve problems involving three sides and one angle in a triangle. The Law of Cosines, a modification of the Pythagorean Theorem, will save the day.

How to Solve Trigonometric Equations for X

9. How to Solve Trigonometric Equations for X

Adding trigonometric functions into standard algebra equations adds complexity. Learn how to solve trigonometric equations for x and how to use inverse operations to simplify equations.

Trigonometric Ratios and Similarity

10. Trigonometric Ratios and Similarity

Where do terms like sine, cosine and tangent come from? In this lesson, we'll learn about how similarity with right triangles leads to trigonometric ratios.

Practice Finding the Trigonometric Ratios

11. Practice Finding the Trigonometric Ratios

So you know what sine, cosine and tangent are. Great! But how do you use them? Find out how in this lesson as we find missing sides and angles using trigonometric ratios.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Other Chapters

Other chapters within the Praxis Mathematics - Content Knowledge (5161): Practice & Study Guide course