Trig Proof 7

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
1188 views | 1 rating
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Lesson Summary:

In this lesson, Julie Harland teaches us how to prove a trig identity by using the basic identities and the identity for the cosine of a sum or difference. She explains how to work through the problem and shows the formal way of writing the proof. By following her step-by-step approach, we can verify trig identities with ease.

Lesson Description:

We verify a Trig identity by using the basic identities and the identity for the cosine of a sum or difference. We prove that (sin(x+y))/(sinx * cosy) = 1 + cotx * tany using a trig proof.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
  • How do prove a trig identity?
  • How do you prove that (sin(x+y))/(sinx * cosy) = 1 + cotx * tany
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson shows again how to prove a trig identity by making one side of the equal sign look like the other side. All steps involved in doing the proof are shown and explained.