$\sin^2 2\theta + \cos^4 2\theta = \frac{3}{4}$ को संतुष्ट करने वाले $\theta \in (0, \frac{\pi}{2})$ के सभी मानों का योग क्या है?

  • A
    $\pi$
  • B
    $\frac{5\pi}{4}$
  • C
    $\frac{\pi}{2}$
  • D
    $\frac{3\pi}{8}$

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