यदि $\alpha = 22^\circ 30'$ है,तो $(1 + \cos \alpha )(1 + \cos 3\alpha )(1 + \cos 5\alpha )(1 + \cos 7\alpha )$ का मान ज्ञात कीजिए।

  • A
    $1/8$
  • B
    $1/4$
  • C
    $\frac{1 + \sqrt{2}}{2\sqrt{2}}$
  • D
    $\frac{\sqrt{2} - 1}{\sqrt{2} + 1}$

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