$\sin ^{-1}\left(\cos \frac{\pi}{13}\right)+\cos ^{-1}\left(\sin \frac{\pi}{13}\right) = $ . . . . . . .

  • A
    $\frac{\pi}{13}$
  • B
    $\frac{15 \pi}{13}$
  • C
    $\frac{11 \pi}{13}$
  • D
    $\frac{9 \pi}{13}$

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