14.cos60°=( )
0 289910 289918 289924 289928 289934 289936 289940 289946 289948 289954 289960 289964 289966 289970 289976 289978 289984 289988 289990 289994 289996 290000 290002 290004 290005 290006 290008 290009 290010 290012 290014 290018 290020 290024 290026 290030 290036 290038 290044 290048 290050 290054 290060 290066 290068 290074 290078 290080 290086 290090 290096 290104 366461
| A. | $\frac{\sqrt{3}}{3}$ | B. | $\frac{1}{2}$ | C. | $\frac{\sqrt{3}}{2}$ | D. | $\sqrt{3}$ |