$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \left(x^2 + \log \left(\frac{\pi-x}{\pi+x}\right) \cdot \cos x\right) dx =$

  • A
    $0$
  • B
    $\frac{\pi^3}{48}$
  • C
    $\frac{\pi^3}{12}$
  • D
    $\frac{\pi^3}{24}$

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