Factor the expression and use fundamental identities.. cos^2xsin^2x-cos^2x
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Originally Posted by jumpman23 Factor the expression and use fundamental identities.. cos^2xsin^2x-cos^2x Factor out a $\displaystyle \cos^2x$ and use the Pythagorean identity, $\displaystyle \sin^2x+\cos^2x=1.$ Hint: Spoiler: $\displaystyle \sin^2x-1=-\left(1-\sin^2x\right)=-\cos^2x$ Or you could just factor out $\displaystyle -\cos^2x$ right from the start.
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