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December 22, 2014

December 22, 2014

Posted by **wade** on Saturday, February 27, 2010 at 10:20pm.

sin2ϴ+cos3ϴ

- math help -
**Reiny**, Saturday, February 27, 2010 at 10:46pmfirst of all you should by now have proven that

sin 2x = 2sinxcosx

by writing cos 3x as cos(2x + x), expanding that and then changing the cos 2x and sin 2x factors you can show that

cos 3x = cos^ 3x - 3 sin^2 x cos x

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