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Trig Proof 5

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Uploaded on Oct 26, 2011

Youtube videos by Julie Harland are organized at http://YourMathGal.com. 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.

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    Education

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    Standard YouTube License

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