$\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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$\tan \frac{2\pi}{5} - \tan \frac{\pi}{15} - \sqrt{3} \tan \frac{2\pi}{5} \tan \frac{\pi}{15}$ ની કિંમત શોધો.

$\sin 15^{\circ}$ નું મૂલ્ય શોધો.

$\frac{\sin A+\sin 7 A+\sin 13 A}{\cos A+\cos 7 A+\cos 13 A} =$

જો $\tan A = \frac{1}{\sqrt{x(x^2+x+1)}}, \tan B = \frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C = (x^{-3}+x^{-2}+x^{-1})^{\frac{1}{2}}$,જ્યાં $0 < A, B, C < \frac{\pi}{2}$,તો $A+B$ ની કિંમત શું થાય?

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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