જો $y=\tan \left(3 \tan ^{-1} x\right)$ હોય,તો $\left(1-3 x^2\right) \frac{d^2 y}{d x^2}-12 x \frac{d y}{d x}=$

  • A
    $6(x+y)$
  • B
    $6(y-x)$
  • C
    $6 y$
  • D
    $-6 x$

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