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October 31, 2014

Homework Help: math(advanced algebra&trigonometry)

Posted by Rony on Saturday, March 27, 2010 at 1:06pm.

the expression cos4x cos3x + sin4x sin3x is equivalent to
which one of the following is the answer:
1) sinx
2) sin7x
3) cosx
4) cos7x

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