Answers

2016-07-26T21:16:41+08:00
 cos² x  dx    =    ( 1+ cos 2x)/2 dx            
                    =   ∫ 1/2 dx +  ∫(1/2 cos 2x) dx

                    =   x/2 + 1/4 sin 2x  + C

   to be able to integrate this function you need to know something about
    trigonometric identities
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