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∫ex (cos x – sin x)dx is equal to(A) ex cos x + C (B) ex sin x + C(C) – ex cos x + C(D) – ex sin x + C |
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Answer» (A) is the correct answer since ∫ex [ f ( x) + f '( x)] dx = ex f ( x) + C . Here f (x) = cosx, f′ (x) = – sin x. |
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