જો $\theta$ એ અંતરાલ $\left(0, \frac{\pi}{2}\right)$ માં હોય અને સમીકરણ $\cos 2 \theta \cdot \sec ^4 \theta + \sec ^2 \theta = 0$ નું સમાધાન કરતું હોય,તો $\sin ^2 \theta =$

  • A
    $\frac{1}{3}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{2}{3}$

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