यदि $\left(\frac{\sin 3 \theta}{\sin \theta}\right)^2-\left(\frac{\cos 3 \theta}{\cos \theta}\right)^2=a \cos b \theta$ है,तो $a: b=$

  • A
    $4: 1$
  • B
    $8: 1$
  • C
    $3: 2$
  • D
    $2: 1$

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