MCQ
$\cos 15^\circ = $
- ✓$\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}} $
$= \sqrt {\frac{{1 + \cos {{30}^o}}}{2}} $ .$\left( {\,\,\,\,\because \cos {{15}^o} > 0} \right)$
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