यदि $\cos p\theta = \cos q\theta$ और $p \neq q$ है,तो

  • A
    $\theta = 2n\pi$
  • B
    $\theta = \frac{2n\pi}{p \pm q}$
  • C
    $\theta = \frac{n\pi}{p + q}$
  • D
    इनमें से कोई नहीं

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