$S = \tan^{-1}\left( \frac{1}{n^2 + n + 1} \right) + \tan^{-1}\left( \frac{1}{n^2 + 3n + 3} \right) + \dots + \tan^{-1}\left( \frac{1}{1 + (n + 19)(n + 20)} \right)$ 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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જો $\tan ^{-1}\left(\frac{1}{4}\right)+\tan ^{-1}\left(\frac{2}{9}\right)=\frac{1}{2} \cos ^{-1} x$ હોય,તો $x$ ની કિંમત શોધો.

જો $y=\tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)+\tan ^{-1}\left(\frac{4 x-4 x^3}{1-6 x^2+x^4}\right)$ હોય, તો $\frac{d y}{d x}$ ની કિંમત શું થાય?

જો $\sin ^{-1} x+\sin ^{-1} y+\sin ^{-1} z=\frac{3 \pi}{2}$ હોય,તો $x^{100}+y^{100}+z^{100}=$

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