Explore everything we offer students and teachers

Explore all of our learning and teaching solutions

Got a Kanye-sized ego? → Test it on our Ego-Meter
Precalc Lesson 5.2 "Proving Trigonometric Identities"

Precalc Lesson 5.2 "Proving Trigonometric Identities"

Author: Chad Bray

To prove that an equation is an identity.

See More

Video of the Lesson

PowerPoint of the Lesson


Write a summary of the lesson. Use proper grammar, punctuation, spelling and complete sentences.

In Class

The next time we meet in class you will complete the assignment below. You may get started ahead of time if you'd like.

Pg. 460 #1-17 (odd), 20-21

Questions and Answers

  • Answer 1
    Mariel Mico Filosopo 9 months ago

    how do you verify that (1+cosA)(1-cosA) is equal to sin^2A?

      Chad Bray answered 8 months ago

      Mariel-Use the distributive property to obtain 1-cosA+cosA-cos^2A. Simplify to 1-cos^2A. Use Pythagorean Identities to substitute sin^2A.

College Algebra

Do the math.
Our College Algebra Course is only $329.

Sophia's online courses not only save you money, but credits are also eligible for transfer to over 2,000 colleges and universities.*