If $\cos p\theta = \cos q\theta$ and $p \neq q$,then

  • A
    $\theta = 2n\pi$
  • B
    $\theta = \frac{2n\pi}{p \pm q}$
  • C
    $\theta = \frac{n\pi}{p + q}$
  • D
    None of these

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