Posted by Tara on Monday, January 4, 2010 at 9:06pm.
sin x cos^2x-sinx=sinx(cos^2x-1) they took out a common factor of sinx
=-sinx(1-cos^2x) recall that sin^2x + cos^2x = 1, and then 1-cos^2x = sin^2x.
Notice they had cos^2x-1 which is -(1-cos^2x). Also notice that there is now a - in front of the sinx
=-sinx(sin^2x) (Where does sine come from and what happend to cosine?)
=-sin^3x
does it make sense now?
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