gaokao 2015 Q12

gaokao · China · sichuan-science Addition & Double Angle Formulae Simplification of Trigonometric Expressions with Specific Angles

12. $\sin 15 ^ { \circ } + \sin 75 ^ { \circ } = \_\_\_\_$.

12. $\sin 15 ^ { \circ } + \sin 75 ^ { \circ } = \_\_\_\_$.