Sunday, August 11, 2013

Rewrite as a product, then simply if possible: cos7x-cos5x

cos7x-cos5x=%0D%0A%0D%0A-2sin%28%287x%2B5x%29%2F2%29sin%28%287x-2x%29%2F2%29%0D%0A 

-2sin%28%287x%2B5x%29%2F2%29sin%28%287x-2x%29%2F2%29=-2sin%286x%29sin%28x%29%0D%0A 

:)
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