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Question

Show algebraically how to confirm that cos2x=cos^2x-sin^2x using the sum and difference identities
Jul 15, 2012

Answers

huh?
cos 2 x = cos ( x+x )
= cos x cos x - sin x sin x
= cos^2 x - sin^2 x
Jul 15, 2012
no
Jun 4, 2020

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