February 22, 2017

Homework Help: Pre-Cal

Posted by Hannah on Saturday, February 27, 2010 at 10:38pm.

1) Verify the identity

cos^2 B - sin^2 B = 2 cos^2 B -1

I know that cos^2 B - sin^2 B = 2 cos^2 B -1 by the double angle formula but I do not know how to show this.

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