Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
Easy$\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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