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Question

Integrate the function sinxsin(xa)

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Solution

Let xa=tdx=dt
sinxsin(xa)dx=sin(ta)sintdt
=sintcosa+costsinasintdt
=(cosa+cottsina)dt
=tcosa+sinalog|sint|+C1
=(xa)cosa+sinalog|sin(xa)|+C1
=xcosa+sinalog|sin(xa)|acosa+C1
=sinalog|sin(xa)|+xcosa+C

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