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

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

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$(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8} \Rightarrow x=$

શ્રેણીનો સરવાળો શોધો: $\tan^{-1} \left( \frac{1}{1 + 1 \times 2} \right) + \tan^{-1} \left( \frac{1}{1 + 2 \times 3} \right) + \dots + \tan^{-1} \left( \frac{1}{1 + n(n + 1)} \right) =$

$2{\tan ^{ - 1}}\frac{1}{3} + {\tan ^{ - 1}}\frac{1}{2} = $

$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

જો $\alpha = \cos^{-1}\left(\frac{3}{5}\right)$ અને $\beta = \tan^{-1}\left(\frac{1}{3}\right)$,જ્યાં $0 < \alpha, \beta < \frac{\pi}{2}$,તો $\alpha - \beta$ ની કિંમત શોધો.

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