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April 20, 2014

Homework Help: Trig

Posted by Tara on Monday, January 4, 2010 at 9:06pm.

Simplify sin x cos^2x-sinx

Here's my book's explanation which I don't totally follow

sin x cos^2x-sinx=sinx(cos^2x-1)
=-sinx(1-cos^2x)
=-sinx(sin^2x) (Where does sine come from and what happend to cosine?)
=-sin^3x

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