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2015-01-03T13:26:46+05:30

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Looks like the problem is  integration of  Sin 6x Cos 5x

f(x) =  Sin 6x Cos 5x = 1/2 [ Sin 11 x  + Sin x ]

Integration of f(x) with respect to x gives us 
 
    - 1/22 Cos 11x - 1/2 Cos x + K

1 5 1