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int(cos3xcos2x+sin3xsin2x)/(1-cos^2)dx...

`int(cos3xcos2x+sin3xsin2x)/(1-cos^2)dx`

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`int(cos3xcos2x+sin3xsin2x)/(1-cos^2)dx`
=`intcos(3x-2x)/(1-cos^2x)dx`
=`intcosx/sin^2xdx=int1/sinx.cosx/sinx dx`
=`intcosecx.cotxdx=-cosecx+C`
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