વિધેય $\tan^{-1} x$ નું દ્વિતીય ક્રમનું વિકલિત શોધો.

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

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