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 $\cos^{-1} \left( \frac{x}{2} \right) + \cos^{-1} \left( \frac{y}{3} \right) = \theta$ હોય,તો $9 x^{2} - 12 x y \cos \theta + 4 y^{2} =$ શું થાય?

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