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

  • A
    $\frac{\pi^2}{4}$
  • B
    $\frac{\pi^2}{2}$
  • C
    $\frac{3\pi^2}{2}$
  • D
    $\frac{\pi^2}{3}$

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