यदि $\sinh x = \frac{\sqrt{21}}{2}$ है,तो $\cosh 2x + \sinh 2x = $

  • A
    $\frac{21}{2}$
  • B
    $\frac{25}{2}$
  • C
    $\frac{23 + 5\sqrt{21}}{2}$
  • D
    $\frac{32 + 5\sqrt{23}}{2}$

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कथन $(A)$: यदि $\sqrt{4 \sin^4 \theta + \sin^2 2\theta} + 4 \cos^2\left(\frac{\pi}{4} - \frac{\theta}{2}\right) = 2$ है,तो $\theta$ $3^{\text{rd}}$ चतुर्थांश या $4^{\text{th}}$ चतुर्थांश में स्थित है।
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