यदि $y=\frac{\log _e x}{x}$ और $z=\log _e x$ है, तो $\frac{d^2 y}{d z^2}+\frac{d y}{d z}$ का मान ज्ञात कीजिए।

  • A
    $e^{-z}$
  • B
    $2 e^{-z}$
  • C
    $z e^{-z}$
  • D
    $-e^{-z}$

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यदि $\cos ^{-1}\left(\frac{y}{b}\right)=2 \log \left(\frac{x}{2}\right)$,जहाँ $x>0$,तो $x^2 \frac{d^2 y}{d x^2}+x \frac{d y}{d x}$ का मान क्या होगा?

यदि $f(x)=\tan ^{-1}\left[\frac{\log \left(\frac{e}{x^{2}}\right)}{\log \left(e x^{2}\right)}\right]+\tan ^{-1}\left[\frac{3+2 \log x}{1-6 \log x}\right]$ है, तो $f^{\prime \prime}(x)$ का मान क्या होगा?

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