Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \frac{e^{x}(1+x)}{\cos ^{2}\left(x e^{x}\right)} d x=?$
A. $\tan \left(x e^{x}\right)+C$
B. $\cot \left(x e^{x}\right)+C$
C. $e^{x} \tan x+C$
D. none of these
Solution:
