1.

What is `int e^(e^(x)) e^(x) dx` equal to ?A. `e^(e^(x)) + c`B. `2e^(e^(x)) + c`C. `e^(e^(x)) e^(x) + c`D. `2e^(e^(x)) e^(x) + c`

Answer» Correct Answer - A
`I = int e^(x) e^(x) dx`
Let `e^(x) = y rArr e^(x) dx = dy`
`dx = (dy)/(e^(x))`
`I = int e^(y) e^(x) (dy)/(e^(x)) = int e^(y) dy = e^(y) + c`
`I = int e^(y) e^(x) (dy)/(e^(x)) = int e^(y) dy = e^(y) + c`
`I = e^(e^(x)) + c`


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