$\frac{e^{4x} + e^{-4x} + 14}{4(e^x - e^{-x})^2} = \dots$

  • A
    $\sinh^2 x + \coth^2 x$
  • B
    $\sinh^2 x + \text{sech}^2 x$
  • C
    $\cosh^2 x + \text{sech}^2 x$
  • D
    $\cosh^2 x + \tanh^2 x$

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$\operatorname{Tanh}^{-1}\left(\frac{1}{3}\right)+\operatorname{Coth}^{-1}(3)=$

यदि $\sin (\theta + \alpha ) = a$ और $\sin (\theta + \beta ) = b$ है,तो $\cos 2(\alpha - \beta ) - 4ab\cos (\alpha - \beta )$ का मान ज्ञात कीजिए।

Difficult
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यदि $\cos x + \cos y - \cos (x + y) = \frac{3}{2}$ है,तो

यदि $2 \tan^2 \theta - 4 \sec \theta + 3 = 0$ है,तो $2 \sec \theta =$

$\operatorname{Sech}^{-1}(\sin \alpha) =$

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