ધારો કે $S_{k} = \sum_{r=1}^{k} \tan^{-1}\left(\frac{6^{r}}{2^{2r+1} + 3^{2r+1}}\right)$. તો $\lim_{k \rightarrow \infty} S_{k}$ ની કિંમત શોધો.

  • A
    $\tan^{-1}\left(\frac{3}{2}\right)$
  • B
    $\frac{\pi}{2}$
  • C
    $\cot^{-1}\left(\frac{3}{2}\right)$
  • D
    $\tan^{-1}(3)$

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${\tan ^{ - 1}}\left[ {\frac{{\sqrt {1 + {x^2}} + \sqrt {1 - {x^2}} }}{{\sqrt {1 + {x^2}} - \sqrt {1 - {x^2}} }}} \right]$,જ્યાં $|x| < 1$ અને $x \ne 0$ હોય,તેની કિંમત શું થાય?

જો ${x_1}, {x_2}, {x_3}, {x_4}$ એ સમીકરણ ${x^4} - {x^3}\sin 2\beta + {x^2}\cos 2\beta - x\cos \beta - \sin \beta = 0$ ના બીજ હોય,તો ${\tan ^{ - 1}}{x_1} + {\tan ^{ - 1}}{x_2} + {\tan ^{ - 1}}{x_3} + {\tan ^{ - 1}}{x_4} = $

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$x > 0$ માટે $\tan ^{-1} \frac{1-x}{1+x}=\frac{1}{2} \tan ^{-1} x$ ઉકેલો.

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$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}\left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} } \right)$ નું મૂલ્ય શોધો.

વિધેયને તેના સરળ સ્વરૂપમાં લખો: $\tan ^{-1}\left(\frac{1}{\sqrt{x^{2}-1}}\right), |x|>1$

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