Trig Proof 8
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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 (cos(A + B))/(sin(A - B)) = (1 - tanA * tanB)/(tanA - tanB) using a trig proof.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- How do you do a trig proof?
- How do you prove that (cos(A + B))/(sin(A - B)) = (1 - tanA * tanB)/(tanA - tanB)?
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Staff Review
This is another good tutorial on how to manipulate one side of a trig equation to prove that it equals the other side. All steps involved in the proof are shown and explained.
