题干
已知cos（x+ π
）=
， 17π12
＜x＜
，则
=____．
| 4 |
| 3 |
| 5 |
| 7 |
| 4 |
| s |
| i |
| n |
| 2 |
| x |
| + |
| 2 |
| s |
| i |
| n |
| 2 |
| x |
| 1 |
| t |
| a |
| n |
| x |
答案(点此获取答案解析）
﹣ 2875
