What is the area between the curve y=cos3x*sin-x, x axis and lines x=o and x=pi?

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We have to find the definite integral of y= - cos 3x * sin x, in the limit x = 0 to x = pi.

Int [ - cos 3x * sin x]

=> Int [ cos 3x * sin dx]

=> Int [ (4(cos x)^3 - 3...

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