જો $y=a \cos (\log x)+b \sin (\log x)$,જ્યાં $a, b$ પ્રાચલો છે,તો $x^2 y^{\prime \prime}+x y^{\prime}$ ની કિંમત શોધો.

  • A
    $y$
  • B
    $-y$
  • C
    $2 y$
  • D
    $-2 y$

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જો $y = (1 - x^2) \operatorname{Tanh}^{-1} x$ હોય,તો $\frac{d^2 y}{d x^2} = $

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