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April 1, 2015

April 1, 2015

Posted by **Nyx** on Monday, November 5, 2012 at 12:32pm.

- Math -
**Steve**, Monday, November 5, 2012 at 1:10pmgood old chain rule:

2 cos^1 x (-sin x) = -2 sin x cos x = -sin 2x

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