જો $\cos (f(x))=\frac{1-x^2}{1+x^2}$ અને $\tan (g(x))=\frac{3 x-x^3}{1-3 x^2}$ હોય,તો $\frac{d f}{d g}=$

  • A
    $\frac{3}{2}$
  • B
    $\frac{1+x^2+2 x^3}{(1-3 x^2)^2}$
  • C
    $\frac{2}{3}$
  • D
    $\frac{x^2+x^3}{(1+x^2)(1-3 x^2)}$

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