$\cos ^{-1}\left(\cos \frac{8 \pi}{3}\right)$ નું મૂલ્ય શોધો.

  • A
    $\frac{8 \pi}{3}$
  • B
    $\frac{\pi}{3}$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\frac{3 \pi}{2}$

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જો $y = \cos^{-1}(\sin x)$, જ્યાં $\frac{\pi}{2} < x < \pi$, તો $\frac{dy}{dx} = \dots$

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