$\int_{0}^{\frac{\pi}{4}} e^{\tan^2 \theta} \sin^2 \theta \tan \theta d\theta =$

  • A
    $\frac{1}{2} \left( \frac{e}{2} - 1 \right)$
  • B
    $\frac{e}{2} - 1$
  • C
    $\frac{\pi}{2}$
  • D
    $2 \left( \frac{\pi}{2} - e \right)$

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