જો $f(n) = \tan \left[\tan ^{-1} \frac{1}{1+2} + \tan ^{-1} \frac{1}{1+6} + \tan ^{-1} \frac{1}{1+12} + \ldots + \tan ^{-1} \frac{1}{1+n(n+1)}\right]$ હોય, તો $f(2021) =$

  • A
    $\frac{2020}{2022}$
  • B
    $\frac{2022}{2024}$
  • C
    $\frac{2021}{2023}$
  • D
    $\frac{2019}{2021}$

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Similar Questions

જો ${x^2} + {y^2} + {z^2} = {r^2}$ હોય,તો ${\tan ^{ - 1}}\left( {\frac{{xy}}{{zr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{yz}}{{xr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{zx}}{{yr}}} \right) = $

$\frac{1}{2}{\cos ^{ - 1}}\left( {\frac{{1 - x}}{{1 + x}}} \right) = $

$\cot^{-1} \left[ \frac{\sqrt{1 - \sin x} + \sqrt{1 + \sin x}}{\sqrt{1 - \sin x} - \sqrt{1 + \sin x}} \right]$ ની કિંમત શોધો, જ્યાં $x \in (0, \frac{\pi}{2})$ છે.

વિધાન $(A): \operatorname{cosech}^{-1}(3) = \log \left(\frac{1+\sqrt{10}}{3}\right)$
કારણ $(R): e^{\operatorname{cosech}^{-1} x}$ એ દ્વિઘાત સમીકરણ $x p^2 - 2p - x = 0$ નું બીજ છે.
નીચેનામાંથી સાચો વિકલ્પ પસંદ કરો.

$2 \pi - \left(\sin ^{-1} \frac{4}{5} + \sin ^{-1} \frac{5}{13} + \sin ^{-1} \frac{16}{65}\right)$ ની કિંમત શોધો.

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