यदि $f(x)=\frac{x-1}{e^x}$ है, तो $f^{\prime}(0)+f^{\prime \prime}(0)=$

  • A
    $0$
  • B
    $1$
  • C
    -$1$
  • D
    $2$

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यदि $y=f(x)$ एक दो बार अवकलनीय फलन है,इस प्रकार कि बिंदु $P$ पर,$\frac{dy}{dx}=4$ और $\frac{d^2y}{dx^2}=-3$ है,तो $\left(\frac{d^2x}{dy^2}\right)_P$ का मान ज्ञात कीजिए।

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