જો $\frac{\cos x}{a} = \frac{\cos (x + \theta)}{b} = \frac{\cos (x + 2\theta)}{c} = \frac{\cos (x + 3\theta)}{d}$ હોય,તો $\left( \frac{a + c}{b + d} \right)$ ની કિંમત શોધો:

  • A
    $\frac{a}{d}$
  • B
    $\frac{c}{d}$
  • C
    $\frac{b}{c}$
  • D
    $\frac{d}{a}$

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