题目描述:
已知sinα=2 |
3 |
A.
2
| ||
3 |
B.
1 |
9 |
C.
5 |
9 |
D. 1−
| ||
3 |
答案解析
【答案】因为sinα=2 |
3 |
2 |
3 |
1 |
9 |
故选B 【其他答案】
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