यदि $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ और $4x^2 = \frac{a}{b}$ है,तो $a + b =$

  • A
    $12$
  • B
    $11$
  • C
    $31$
  • D
    $10$

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यदि $\frac{(x+1)^{2}}{x^{3}+x}=\frac{A}{x}+\frac{Bx+C}{x^{2}+1}$ है,तो $\sin^{-1} A + \tan^{-1} B + \sec^{-1} C$ का मान ज्ञात कीजिए।

$\cosh \left(\sinh ^{-1}(\sqrt{8})+\cosh ^{-1} 5\right)=$

$\sin \left[ \frac{\pi }{2} - \sin^{-1} \left( -\frac{\sqrt{3}}{2} \right) \right] = $

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

मान लीजिए $S_{k} = \sum_{r=1}^{k} \tan^{-1}\left(\frac{6^{r}}{2^{2r+1} + 3^{2r+1}}\right)$. तो $\lim_{k \rightarrow \infty} S_{k}$ का मान ज्ञात कीजिए।

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