જો $\sin ^{-1}\left(\frac{12}{x}\right)+\sin ^{-1}\left(\frac{5}{x}\right)=\frac{\pi}{2}$ હોય, તો $x=$

  • A
    $5$
  • B
    $7$
  • C
    $13$
  • D
    $17$

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$\cot ^{-1}(-\sqrt{3})-\tan ^{-1} \sqrt{3}$ ની કિંમત . . . . . . છે.

$\sin ^{-1} \frac{\sqrt{3}}{2} + \sin ^{-1} \sqrt{\frac{2}{3}} = $

$\cos ^{-1}\left(2 x^{2}-1\right)$ નું $\cos ^{-1} x$ ની સાપેક્ષમાં વિકલન શું થાય?

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