यदि $\alpha$,$25\cos^2\theta + 5\cos\theta - 12 = 0$ का एक मूल है और $\pi/2 < \alpha < \pi$ है,तो $\sin 2\alpha$ का मान ज्ञात कीजिए।

  • A
    $24/25$
  • B
    $-24/25$
  • C
    $13/18$
  • D
    $-13/18$

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