यदि $\int e^x(1+x) \cdot \sec ^2(x e^x) \, dx = f(x) + \text{अचर}$,तो $f(x)$ किसके बराबर है?

  • A
    $\cos(x e^x)$
  • B
    $\sin(x e^x)$
  • C
    $2 \tan^{-1}(x)$
  • D
    $\tan(x e^x)$

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