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September 20, 2014

September 20, 2014

Posted by **Jake** on Thursday, January 26, 2012 at 7:15pm.

1. Simplify cos(x-y)+cos(x+y)/cosx

Formula: cosxcosy= cos(x+y)+cos(x-y)/2

cos(x-y)+cos(x+y)/cosx

=cosxcosy/2cosx

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