题目内容
已知sin(π+α)=-
,则cos(α-
)=______.
| 1 |
| 3 |
| 3π |
| 2 |
由题意得,sin(π+α)=-
,则sinα=
,
∴cos(α-
)=cos(
-α)=-sinα=-
,
故答案为:-
.
| 1 |
| 3 |
| 1 |
| 3 |
∴cos(α-
| 3π |
| 2 |
| 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 |
| 3π |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |