$\cos \left[\sec ^{-1} x+\operatorname{cosec}^{-1} x\right], |x| \geq 1$ का मान . . . . . . के बराबर है।

  • A
    $0$
  • B
    $-1$
  • C
    $\frac{\pi}{2}$
  • D
    $\pi$

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$\sin \left(\cos ^{-1}\left(-\frac{1}{7}\right)+\sin ^{-1}\left(-\frac{1}{7}\right)\right) = $ . . . . . . .

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