1.

∫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

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.



Discussion

No Comment Found