题目内容
已知-
≤x≤
,要使cosx=
成立,则实数m的取值范围是
______.
| π |
| 3 |
| π |
| 6 |
| 6m-1 |
| 6m+5 |
∵-
≤x≤
,
∴
≤cosx≤1,
∴
≤
≤1,
即(
-
)(
-1)≤0,
∴
•
≤0,
∴6m-7≥0,即m≥
.
故答案为:m≥
| π |
| 3 |
| π |
| 6 |
∴
| 1 |
| 2 |
∴
| 1 |
| 2 |
| 6m-1 |
| 6m+5 |
即(
| 6m-1 |
| 6m+5 |
| 1 |
| 2 |
| 6m-1 |
| 6m+5 |
∴
| 6m-7 |
| 2(6m+5) |
| -6 |
| 6m+5 |
∴6m-7≥0,即m≥
| 7 |
| 6 |
故答案为:m≥
| 7 |
| 6 |
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