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 $\theta$ =

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

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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?

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

$2 \cos ^{-1} x = \sin ^{-1} \left( 2 x \sqrt{1 - x^2} \right)$ એ $x$ ની કઈ કિંમતો માટે સાચું છે?

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