यदि $x \cos \theta = y \cos \left( \theta + \frac{2\pi}{3} \right) = z \cos \left( \theta + \frac{4\pi}{3} \right)$ है,तो $\frac{1}{x} + \frac{1}{y} + \frac{1}{z}$ का मान क्या होगा?

  • A
    $1$
  • B
    $2$
  • C
    $0$
  • D
    $3 \cos \theta$

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