જો $y = \cos^{-1}\left(\frac{2x}{1+x^2}\right)$ હોય,તો $\frac{dy}{dx}$ શોધો,જ્યાં $-1 < x < 1$.

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

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ધારો કે $f(x) = \cos^{-1}\left(\frac{2x}{1+x^2}\right) + \sin^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,તો $f(1) + f(2)$ ની કિંમત શોધો.

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