यदि $\sin^{-1} x + \cos^{-1} y = \frac{2\pi}{5}$ है,तो $\cos^{-1} x + \sin^{-1} y$ का मान क्या होगा?

  • A
    $\frac{2\pi}{5}$
  • B
    $\frac{3\pi}{5}$
  • C
    $\frac{4\pi}{5}$
  • D
    $\frac{3\pi}{10}$

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$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

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।

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