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

  • A
    $\frac{2xy}{(1+x^2)^2}$
  • B
    $-\frac{(x+y)}{(1-x^2)^2}$
  • C
    $\frac{2xy}{1-x^2}$
  • D
    $-\frac{2(x+y)}{1-x^2}$

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