Integral Calculus Question 312

Question: $ \int_{{}}^{{}}{e^{x}\sin (e^{x})}\ dx= $

[MP PET 1995]

Options:

A) $ -\cos e^{x}+c $

B) $ \cos e^{x}+c $

C) $ -cosec,e^{x}+c $

D) None of these

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Answer:

Correct Answer: A

Solution:

$ \int_{{}}^{{}}{e^{x}\sin (e^{x}),dx} $ Put $ e^{x}=t $ and $ e^{x}dx=dt, $ the integral reduces to $ \int_{{}}^{{}}{\sin t,dt}=-\cos t+c=-\cos (e^{x})+c. $