题干
若tanα=2tan π18
，则
)sin(α−π18
) 的值为____．
| c |
| o |
| s |
| ( |
| 4 |
| 9 |
答案(点此获取答案解析）
3
的一个根是0，求
rthquake in Yushu ,________the students to return to their classrooms.
