यदि $\cos^3 \theta + \cos^3 \left(\frac{2 \pi}{3} + \theta\right) + \cos^3 \left(\frac{4 \pi}{3} + \theta\right) = \alpha \cos 3 \theta$ है,तो $\alpha$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{4}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{5}{4}$
  • D
    $\frac{7}{4}$

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