यदि $\sin^2 \theta - 2\cos \theta + \frac{1}{4} = 0$ है,तो $\theta$ का व्यापक मान क्या है?

  • A
    $n\pi \pm \frac{\pi}{3}$
  • B
    $2n\pi \pm \frac{\pi}{3}$
  • C
    $2n\pi \pm \frac{\pi}{6}$
  • D
    $n\pi \pm \frac{\pi}{6}$

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