$\sec ^2(\tan ^{-1} 2)+\operatorname{cosec}^2(\cot ^{-1} 3) = $

  • A
    $1$
  • B
    $5$
  • C
    $15$
  • D
    $10$

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मान ज्ञात कीजिए: $\tan^{-1} \left( \frac{1}{\sqrt{x^2 - 1}} \right)$

$2{\sin ^{ - 1}}\frac{3}{5} + {\cos ^{ - 1}}\frac{{24}}{{25}} = $

$\cos \left(\sin ^{-1} \frac{3}{5}+\sin ^{-1} \frac{5}{13}+\sin ^{-1} \frac{33}{65}\right) = . . . . .$

$\tan^{-1}4x + \tan^{-1}6x = \frac{\pi}{6}$ के हलों की संख्या ज्ञात कीजिए, जहाँ $-\frac{1}{2\sqrt{6}} < x < \frac{1}{2\sqrt{6}}$ है।

$\cos \left(\cos ^{-1}\left(-\frac{1}{4}\right)+\sin ^{-1}\left(-\frac{1}{4}\right)\right) = $ . . . . . . .

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