题目内容
已知cos(π+α)=-
,则sin(
-α)的值为______.
| 1 |
| 3 |
| 3π |
| 2 |
∵cos(π+α)=-cosα=-
,∴cosα=
,
则sin(
-α)=-cosα=-
.
故答案为:-
| 1 |
| 3 |
| 1 |
| 3 |
则sin(
| 3π |
| 2 |
| 1 |
| 3 |
故答案为:-
| 1 |
| 3 |
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题目内容
| 1 |
| 3 |
| 3π |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 3π |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |