मान ज्ञात कीजिए: $\cos ^{-1}\left(\frac{4}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)$

  • A
    $\cos ^{-1}\left(\frac{24}{25}\right)$
  • B
    $\cos ^{-1}\left(\frac{33}{65}\right)$
  • C
    $\cos ^{-1}\left(\frac{5}{13}\right)$
  • D
    $\cos ^{-1}\left(\frac{3}{5}\right)$

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$\tan^{-1}\left(\frac{x}{y}\right) - \tan^{-1}\left(\frac{x-y}{x+y}\right)$ का सरलीकृत रूप किसके बराबर है?

यदि $\cos^{-1}\left(\frac{2}{3x}\right) + \cos^{-1}\left(\frac{3}{4x}\right) = \frac{\pi}{2}$ और $x > \frac{3}{4}$ है,तो $x$ का मान ज्ञात कीजिए।

यदि $y = \tan^{-1} \left( \frac{4x}{1 + 5x^2} \right) + \tan^{-1} \left( \frac{2 + 3x}{3 - 2x} \right)$ है,तो $\frac{dy}{dx} = $

यदि $\tan^{-1} \frac{a+x}{a} + \tan^{-1} \frac{a-x}{a} = \frac{\pi}{6}$ है,तो $x^2 =$

$\cot \left(\operatorname{cosec}^{-1} \frac{5}{3}+\tan ^{-1} \frac{2}{3}\right)$ का मान ज्ञात कीजिए।

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