(2011•广安二模)若角a的终边过点P(-1,0),则sin(α+π3)等于(  ) A.0 B.-12 C.32 D.-32

问题描述:

(2011•广安二模)若角a的终边过点P(-1,0),则sin(α+

π
3
)等于(  )
A. 0
B. -
1
2

C.
3
2

D. -
3
2

由角a的终边过点P(-1,0),得到α=2kπ+

2

则sin(α+
π
3
)=sin(2kπ+
2
+
π
3
)=-sin
π
3
=-
3
2

故选D