यदि $\cos^{-1}\left(\frac{x}{a}\right) + \cos^{-1}\left(\frac{y}{b}\right) = \alpha$ है,तो $\frac{x^2}{a^2} - \frac{2xy}{ab}\cos \alpha + \frac{y^2}{b^2} = $

  • A
    $\sin^2 \alpha$
  • B
    $\cos^2 \alpha$
  • C
    $\tan^2 \alpha$
  • D
    $\cot^2 \alpha$

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यदि $ a + \frac{\pi}{2} < 2 \tan^{-1} x + 3 \cot^{-1} x < b $ है,तो $ a $ और $ b $ के मान ज्ञात कीजिए।

यदि $3 \tan^{-1} x + \cot^{-1} x = \pi$ है,तो $x$ का मान ज्ञात कीजिए।

यदि $\alpha = \cos^{-1}\left(\frac{3}{5}\right)$ और $\beta = \tan^{-1}\left(\frac{1}{3}\right)$,जहाँ $0 < \alpha, \beta < \frac{\pi}{2}$,तो $\alpha - \beta$ का मान ज्ञात कीजिए।

यदि $\sin ^{-1}\left(\frac{12}{x}\right)+\sin ^{-1}\left(\frac{5}{x}\right)=\frac{\pi}{2}$ है, तो $x=$

यदि $(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8}$ है,तो $x$ का मान ज्ञात कीजिए।

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