यदि $y = \log_{\sin x}(\tan x)$ है,तो $\left( \frac{dy}{dx} \right)_{\pi/4} = $

  • A
    $\frac{4}{\log 2}$
  • B
    $-4 \log 2$
  • C
    $\frac{-4}{\log 2}$
  • D
    इनमें से कोई नहीं

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