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2 answers

sin^2 x - cos^2 x = - cos(2x)
you should be able to continue now.

2007-07-08 15:16:05 · answer #1 · answered by swd 6 · 3 0

Use the identity cos 2x = cos² x - sin² x
So you have to find -∫ cos 2x dx = - ½ sin 2x + C.

2007-07-08 15:17:42 · answer #2 · answered by steiner1745 7 · 2 0

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