ધારો કે $\theta$ અને $\phi \neq 0$ એવા છે કે જેથી $\sec(\theta + \phi)$,$\sec \theta$,અને $\sec(\theta - \phi)$ એ $A.P.$ માં છે. જો $\cos \theta = k \cos(\frac{\phi}{2})$ કોઈ $k$ માટે હોય,તો $k$ ની કિંમત શોધો.

  • A
    $\pm \sqrt{2}$
  • B
    $\pm 1$
  • C
    $\pm \frac{1}{\sqrt{2}}$
  • D
    $\pm 2$

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