$2 \sin(12^{\circ}) - \sin(72^{\circ})$ નું મૂલ્ય શું છે?

  • A
    $\frac{\sqrt{5}(1-\sqrt{3})}{4}$
  • B
    $\frac{1-\sqrt{5}}{8}$
  • C
    $\frac{\sqrt{3}(1-\sqrt{5})}{2}$
  • D
    $\frac{\sqrt{3}(1-\sqrt{5})}{4}$

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ધારો કે $|\cos \theta \cos (60^{\circ}-\theta) \cos (60^{\circ}+\theta)| \leq \frac{1}{8}$, જ્યાં $\theta \in [0, 2\pi]$. તો, તમામ $\theta \in [0, 2\pi]$ નો સરવાળો શોધો જ્યાં $\cos 3\theta$ તેની મહત્તમ કિંમત પ્રાપ્ત કરે છે: ($\pi$ માં)

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