यदि $\sec (\theta+\alpha), \sec \theta$ और $\sec (\theta-\alpha)$ समांतर श्रेणी में हैं,तो $\sin ^2 \theta=$

  • A
    $\cos \alpha$
  • B
    $2 \cos \alpha$
  • C
    $-2 \cos \alpha$
  • D
    $-\cos \alpha$

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