જો $x>0, y>0, z>0, xy+yz+zx < 1$ અને જો $\tan^{-1} x + \tan^{-1} y + \tan^{-1} z = \pi$ હોય, તો $x+y+z$ ની કિંમત શું થાય?

  • A
    $0$
  • B
    $xyz$
  • C
    $3xyz$
  • D
    $\sqrt{xyz}$

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$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

$\sinh^{-1}\left(\frac{x}{\sqrt{1-x^2}}\right)$ કોના બરાબર છે?

જો $\tan^{-1} \frac{1}{1+1(2)} + \tan^{-1} \frac{1}{1+2(3)} + \tan^{-1} \frac{1}{1+3(4)} + \dots + \tan^{-1} \frac{1}{1+n(n+1)} = \tan^{-1} \theta$ હોય,તો $\theta$ =

કિંમત શોધો: $\tan^{-1}\left(\frac{1}{4}\right) + \tan^{-1}\left(\frac{2}{9}\right) = $

જો $\tan ^{-1}\left(\frac{1-x}{1+x}\right)-\frac{1}{2} \tan ^{-1} x=0$,$x>0$ માટે,તો $x=$

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