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Question
Integrate the function in x sin x.
Solution
Let `I = int x sin x dx`
`= x int sin x dx - int [d/dx (x) int sin x dx] dx`
[Integration by Parts]
`= x (- cos x) - int 1 (- cos x) dx`
`= - x cos x + int cos x dx`
`= - x cos x + sin x + C`
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