题目内容
已知cos(α+
)-sinα=
,则sin(
-α)=______.
| π |
| 6 |
3
| ||
| 5 |
| π |
| 6 |
∵cos(α+
)-sinα
=
cosα-
sinα-sinα
=
cosα-
sinα
=
(
cosα-
sinα)
=
sin(
-α)=
,
∴sin(
-α)=
.
故答案为:
| π |
| 6 |
=
| ||
| 2 |
| 1 |
| 2 |
=
| ||
| 2 |
| 3 |
| 2 |
=
| 3 |
| 1 |
| 2 |
| ||
| 2 |
=
| 3 |
| π |
| 6 |
3
| ||
| 5 |
∴sin(
| π |
| 6 |
| 3 |
| 5 |
故答案为:
| 3 |
| 5 |
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相关题目
已知cos(α-
)+sinα=
,则sin(α+
)的值是( )
| π |
| 6 |
| 4 |
| 5 |
| 3 |
| 7π |
| 6 |
A、-
| ||||
B、
| ||||
C、-
| ||||
D、
|