题目内容
函数y=
的值域是______.
| 3cosx+1 |
| cosx+2 |
由题意y=
=3-
∵-1≤cosx≤1,∴1≤cosx+2≤3,∴
≤
≤5
∴函数y=
的值域是[-2,
]
故答案为[-2,
]
| 3cosx+1 |
| cosx+2 |
| 5 |
| cosx+2 |
∵-1≤cosx≤1,∴1≤cosx+2≤3,∴
| 5 |
| 3 |
| 5 |
| cosx+2 |
∴函数y=
| 3cosx+1 |
| cosx+2 |
| 4 |
| 3 |
故答案为[-2,
| 4 |
| 3 |
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