Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
EasyThe value of $4 \cos^3 20^{\circ}$ is
- A$-\frac{1}{2} - \cos 20^{\circ}$
- B$-\frac{1}{2} + 3 \cos 20^{\circ}$
- C$\frac{1}{2} + 3 \cos 20^{\circ}$
- D$\frac{1}{2} - 3 \cos 20^{\circ}$
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