मान लीजिए $f(x) = \cos^{-1}\left(\frac{2x}{1+x^2}\right) + \sin^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,तो $f(1) + f(2)$ का मान ज्ञात कीजिए।

  • A
    $-\pi$
  • B
    $0$
  • C
    $\pi$
  • D
    $2\pi$

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