$x=\frac{\pi}{2}$ पर $\cos x$ के सापेक्ष $(\log x)^{\sin x}$ का अवकलज क्या है?

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

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