$9\tan^2\theta + 4\cot^2\theta$ ની ન્યૂનતમ કિંમત કેટલી છે?

  • A
    $13$
  • B
    $9$
  • C
    $6$
  • D
    $12$

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$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} + \cos^2 \frac{5\pi}{12}$ નું મૂલ્ય શોધો.

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