$S = \tan^{-1}\left( \frac{1}{n^2 + n + 1} \right) + \tan^{-1}\left( \frac{1}{n^2 + 3n + 3} \right) + \dots + \tan^{-1}\left( \frac{1}{1 + (n + 19)(n + 20)} \right)$ હોય,તો $\tan S$ ની કિંમત શોધો.

  • A
    $\frac{20}{n^2 + 20n + 1}$
  • B
    $\frac{n}{n^2 + 20n + 1}$
  • C
    $\frac{20}{401 + 20n}$
  • D
    $\frac{n}{401 + 20n}$

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$\cos \left[\cos ^{-1}\left(-\frac{1}{7}\right)+\sin ^{-1}\left(-\frac{1}{7}\right)\right]$ ની કિંમત શોધો.

જો $(\tan^{-1} x)^2 + (\cot^{-1} x)^2 = \frac{5\pi^2}{8}$ હોય,તો $x$ =

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$|x| < \frac{1}{\sqrt{2}}, x \neq 0$ માટે $\tan ^{-1}\left(\frac{\sqrt{1+x^2}+\sqrt{1-x^2}}{\sqrt{1+x^2}-\sqrt{1-x^2}}\right)$ ની કિંમત શોધો.

જો $\alpha > \beta > \gamma > 0$ હોય,તો પદાવલિ $\cot ^{-1}\left\{\beta+\frac{(1+\beta^2)}{(\alpha-\beta)}\right\}+\cot ^{-1}\left\{\gamma+\frac{(1+\gamma^2)}{(\beta-\gamma)}\right\}+\cot ^{-1}\left\{\alpha+\frac{(1+\alpha^2)}{(\gamma-\alpha)}\right\}$ ની કિંમત શું થાય?

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

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