यदि $\sin \alpha = \frac{-3}{5}$ जहाँ $\pi < \alpha < \frac{3\pi}{2}$ है,तो $\cos \frac{\alpha}{2} = $

  • A
    $\frac{-1}{\sqrt{10}}$
  • B
    $\frac{1}{\sqrt{10}}$
  • C
    $\frac{3}{\sqrt{10}}$
  • D
    $\frac{-3}{\sqrt{10}}$

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यदि $540^{\circ} < \theta < 630^{\circ}$ और $\tan \theta = \frac{5}{12}$ है,तो $\frac{\cos \frac{\theta}{2} - 5 \sin \frac{\theta}{2}}{\sqrt{-(12 \sec \theta + 5 \operatorname{cosec} \theta)}} = $

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