જો $m \tan (\theta - 30^\circ) = n \tan (\theta + 120^\circ)$ હોય,તો $\frac{m + n}{m - n} = $

  • A
    $2 \cos 2\theta$
  • B
    $\cos 2\theta$
  • C
    $2 \sin 2\theta$
  • D
    $\sin 2\theta$

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જો $\frac{x}{\cos \alpha} = \frac{y}{\cos \left(\frac{2 \pi}{3} - \alpha\right)} = \frac{z}{\cos \left(\frac{2 \pi}{3} + \alpha\right)}$ હોય,તો $(x + y + z)$ ની કિંમત કેટલી થાય?

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