Trig Proof 5
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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(x+y))/(cosx * cosy) = 1 - tanx * 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 you verify trig identities?
- How can you prove that (cos(x+y))/(cosx * cosy) = 1 - tanx * tany
- How do you make one side of the equal sign equal the other side in a trig proof?
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Staff Review
This lesson shows how to do a trig proof by making one side of the equal sign look like the other side. All steps of the proof are shown in a way just as you would be expected to complete such a proof. This is a great trig proof tutorial.
