Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
Easy$\cos 15^\circ = $
- A$\sqrt{\frac{1 + \cos 30^\circ}{2}}$
- B$\sqrt{\frac{1 - \cos 30^\circ}{2}}$
- C$\pm \sqrt{\frac{1 + \cos 30^\circ}{2}}$
- D$\pm \sqrt{\frac{1 - \cos 30^\circ}{2}}$
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