$x=\frac{\pi}{4}$ पर $\log _{e} 2 \cdot \frac{d}{dx}(\log _{\cos x} \operatorname{cosec} x)$ का मान ज्ञात कीजिए।

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

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$\frac{d}{d x}(\log _{|x|} e) =$ . . . . . .

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