$\frac{1}{2} + \cos x + \cos 2x + \cos 3x + \cos 4x = 0$ का हल है:

  • A
    $x = \frac{2n\pi}{9}, n \in I, n \neq 9m, m \in I$
  • B
    $x = \frac{2n\pi}{9}, n \in I, n = 9m, m \in I$
  • C
    $x = \frac{n\pi}{9} + \frac{\pi}{2}, n \in I$
  • D
    $x = \frac{2n\pi}{3} + \frac{\pi}{6}, n \in I$

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