$\theta$ और $\alpha$ $Q_3$ में स्थित हैं। यदि $\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)$ हरात्मक श्रेणी में हैं,तो $\cos \theta \sec \frac{\alpha}{2} = $

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

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