જો $\cos^{-1} x + \cos^{-1} y + \cos^{-1} z = \pi$ હોય,તો

  • A
    $x^2 + y^2 + z^2 + xyz = 0$
  • B
    $x^2 + y^2 + z^2 + 2xyz = 0$
  • C
    $x^2 + y^2 + z^2 + xyz = 1$
  • D
    $x^2 + y^2 + z^2 + 2xyz = 1$

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ધારો કે $S_{n} = \cot^{-1} 2 + \cot^{-1} 8 + \cot^{-1} 18 + \cot^{-1} 32 + \dots$ એ $n$ માં પદ સુધી છે. તો $\lim_{n \rightarrow \infty} S_{n}$ શું થાય?

જો $\sin ^{ - 1}\frac{{2a}}{{1 + {a^2}}} - \cos ^{ - 1}\frac{{1 - {b^2}}}{{1 + {b^2}}} = \tan ^{ - 1}\frac{{2x}}{{1 - {x^2}}}$,હોય,તો $x = $

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$\frac{d}{dx}[\tan^{-1}(\cot x) + \cot^{-1}(\tan x)] = $

$\lim _{x \rightarrow 0^{+}} \frac{x \sin ^{-1}\left(\frac{2 x}{1+x^2}\right)}{\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) \tan ^{-1}\left(\frac{3 x-x^3}{1-3 x^2}\right)}$ ની કિંમત શોધો.

કિંમત શોધો: $\tan^{-1}\left(\frac{1}{4}\right) + \tan^{-1}\left(\frac{2}{9}\right) = $

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