5. If (xsin x dx = -xcos x +a , then the value of a will be: (a) sin x + c (b) cos x + c (c)c (d) None of these.

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( int propto sin x d x ) ( x int sin x-intleft[frac{d}{d x}(x) int sin x d xright] d x ) ( -x cos x-int(1)(-cos x) d x ) ( -x cos x+int cos x d x ) ( -x sin x+c ) ( sin alpha=sin x+c )

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