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

  • 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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मान ज्ञात कीजिए: $\sin ^4 \frac{\pi}{8} + \sin ^4 \frac{3\pi}{8} + \sin ^4 \frac{5\pi}{8} + \sin ^4 \frac{7\pi}{8} = $

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