# Ch 11: Introduction to Trigonometric Functions

Review trigonometric function basics with the short video and text lessons provided in this engaging chapter. Before taking an important exam, use the self-assessment quizzes to test your understanding so you know where to focus your studies.

## Introduction to Trigonometric Functions - Chapter Summary

This fun chapter teaches you about solving trigonometric functions that involve cosines, sines and inverse trigonometry functions. You'll learn an easy pattern to memorize the points, radians and degree measures in the first quadrant of the unit circle. Other topics include using the unit circle to help better understand trigonometric concepts and the two special right triangles that can help you solve triangle problems. After you work through this chapter, you will be able to:

• Identify what secant, cosecant and cotangent functions are
• Give examples of radians and degrees
• Use the unit circle to find angles in radians
• Describe the six trigonometric functions
• Use the double angle formula

Engaging video and text lessons outline key trig functions in an easy-to-follow format. Before or after reviewing the lessons, take the self-assessment quizzes to gauge your understanding of these topics. To go back and re-watch just a portion of a video lesson, use the video tabs feature in the Timeline. Feel free to study any time you'd like, 24 hours a day, on any computer, tablet or mobile phone.

11 Lessons in Chapter 11: Introduction to Trigonometric Functions
Test your knowledge with a 30-question chapter practice test
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

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