Trig Proof 7
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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
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Staff Review
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.
