यदि $y=\tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)+\tan ^{-1}\left(\frac{4 x-4 x^3}{1-6 x^2+x^4}\right)$ है, तो $\frac{d y}{d x}$ का मान क्या होगा?

  • A
    $\frac{2}{1+x^2}$
  • B
    $\frac{4}{1+x^2}$
  • C
    $\frac{6}{1+x^2}$
  • D
    $\frac{7}{1+x^2}$

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