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July 7, 2015

Homework Help: Pre-Cal

Posted by Hannah on Sunday, February 28, 2010 at 12:27pm.

verify the identity

sin x(1 - 2 cos^2 x + cos^4 x) = sin^5 x

1-2cos^2 x looks like 2cos^2x-1 its just backwards. I am not sure where to start.

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