यदि $\tan \theta \cdot \cos 60^{\circ} = \frac{\sqrt{3}}{2}$ है,तो $\sin (\theta - 15^{\circ})$ का मान ज्ञात कीजिए।

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

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यदि $\sin \alpha = \frac{2pq}{p^2 + q^2}$ है,तो $\sec \alpha - \tan \alpha = $

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