82 Indefinite Integrals 12 If xe cos xdx ae b 1 x sin x xcos x d where d is constant of integration then 2a 2b 13 Let f x xinx 1

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82 Indefinite Integrals 12 If xe cos xdx ae b 1 x sin x xcos x d where d is constant of integration then 2a 2b 13 Let f x xinx 1 xcos x Inx sin x dx and f x 1 dx 14 Let f x x 3x 6 3 and f 1 inx dx In A is 15 If X e B 1 21 3 7 e 2 4 Then the value of cosf 21 is Then the value of f 2 is c where c is constant of integration then the value of A

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