$\cos ^{ - 1}\frac{4}{5} + \tan ^{ - 1}\frac{3}{5} = $

  • A
    $\tan ^{ - 1}\frac{27}{11}$
  • B
    $\sin ^{ - 1}\frac{11}{27}$
  • C
    $\cos ^{ - 1}\frac{11}{27}$
  • D
    આમાંથી કોઈ નહીં

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સાબિત કરો કે $\cot ^{-1}\left(\frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}\right)=\frac{x}{2}$,જ્યાં $x \in\left(0, \frac{\pi}{4}\right)$.

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$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

જો $ a + \frac{\pi}{2} < 2 \tan^{-1} x + 3 \cot^{-1} x < b $ હોય,તો $ a $ અને $ b $ ની કિંમતો શોધો.

સાબિત કરો કે $2 \sin ^{-1} \frac{3}{5} = \tan ^{-1} \frac{24}{7}$.

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.

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