SOLVED:Choose the correct answer. \int \frac{e^{x}(1+x)}{\cos ^{2}\left(e^{x} x\right)} d x equals (A) -\cot \left(e x^{x}\right)+C (B) \tan \left(x e^{x}\right)+\mathrm{C} (C) \tan \left(e^{x}\right)+\mathrm{C} (D) \cot \left(e^{x}\right)+\mathrm{C}