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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$\frac{d}{dx}(5^{\log x}) = \dots$

यदि $f(x) = \log_{5} \log_{3} x$ है, तो $f^{\prime}(e)$ का मान ज्ञात कीजिए।

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