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February 1, 2015

February 1, 2015

Posted by **eve** on Saturday, May 5, 2012 at 1:11pm.

cosx - cos(2x) =

- math -
**MathMate**, Sunday, May 6, 2012 at 8:12amuse the identity

cos(2x)=cos²(x)-sin²(x)

if it is an equation, we will need something on the right hand side.

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