यदि $y = a{e^x} + b{e^{-x}} + c$ जहाँ $a, b, c$ प्राचल (parameters) हैं,तो $y''' = $

  • A
    $y$
  • B
    $y'$
  • C
    $0$
  • D
    $y''$

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यदि $y = \frac{\log x}{x}$ है,तो $x = 1$ पर $\frac{d^2 y}{d x^2}$ का मान ज्ञात कीजिए।

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