$\int_0^\pi \frac{x \tan x}{\sec x + \tan x} \,dx = $

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

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