$\cosh \left(\sinh ^{-1}(\sqrt{8})+\cosh ^{-1} 5\right)=$

  • A
    $\sqrt{6}+4 \sqrt{2}$
  • B
    $15+8 \sqrt{3}$
  • C
    $6 \sqrt{6}+10 \sqrt{2}$
  • D
    $8-15 \sqrt{3}$

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यदि $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ पदों तक है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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यदि ${\tan ^{ - 1}}x + {\tan ^{ - 1}}y + {\tan ^{ - 1}}z = \pi ,$ तो $\frac{1}{{xy}} + \frac{1}{{yz}} + \frac{1}{{zx}} = $

यदि ${\cot ^{ - 1}}\frac{n}{\pi } > \frac{\pi }{6},\,\,n \in N$ है,तो $n$ का अधिकतम मान क्या है?

यदि $y = \sin^{-1}(x\sqrt{1 - x} + \sqrt{x}\sqrt{1 - x^2})$ है,तो $\frac{dy}{dx} = $

यदि $\sin ^{-1}\left(\frac{x}{5}\right)+\operatorname{cosec}^{-1}\left(\frac{5}{4}\right)=\frac{\pi}{2}$,तो $5+x=$

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