વાસ્તવિક કિંમતો $\theta$ માટે $\cos 2\theta + \cos \theta$ ની ન્યૂનતમ કિંમત શું છે?

  • A
    $-9/8$
  • B
    $0$
  • C
    $-2$
  • D
    આમાંથી કોઈ નહીં

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