જો $0 < x < 1$ હોય,તો $y = \cos^{-1}\left(\frac{1-x^2}{1+x^2}\right)$ માટે $\frac{dy}{dx}$ શોધો.

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

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જો $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$ હોય, તો $x^{9}+y^{9}+z^{9}-\frac{1}{x^{9} y^{9} z^{9}}$ ની કિંમત કેટલી થાય?

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