$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

  • A
    $\cos A$
  • B
    $0$
  • C
    $\sqrt{3} \sin A$
  • D
    $\sqrt{3} \cos A$

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સાબિત કરો કે: $(\cos x+\cos y)^{2}+(\sin x-\sin y)^{2}=4 \cos ^{2} \frac{x+y}{2}$

કિંમત શોધો: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$

$\cos 12^\circ + \cos 84^\circ + \cos 156^\circ + \cos 132^\circ$ નું મૂલ્ય શોધો.

$1 + \cos 2x + \cos 4x + \cos 6x = $

જો $\frac{1-\tan \theta}{1+\tan \theta}=\frac{1}{\sqrt{3}}$,જ્યાં $\theta \in \left(0, \frac{\pi}{2}\right)$,તો $\theta=$

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