题目内容
函数f(x)=
sinxsin(x+
)+sin2x在[0,
]上的值域是______.
| 3 |
| π |
| 2 |
| 2π |
| 3 |
因为f(x)=
sinxsin(x+
)+sin2x=
sinxcosx+
=
sin2x-
cos2x+
=sin(2x-
)+
,x∈[0,
]?2x-
∈[-
,
]?sin(2x-
)∈[-
,1],
故f(x)∈[0,
]
故答案为:[0,
]
| 3 |
| π |
| 2 |
| 3 |
| 1-cos2x |
| 2 |
| ||
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| π |
| 6 |
| 1 |
| 2 |
| 2π |
| 3 |
| π |
| 6 |
| π |
| 6 |
| 7π |
| 6 |
| π |
| 6 |
| 1 |
| 2 |
故f(x)∈[0,
| 3 |
| 2 |
故答案为:[0,
| 3 |
| 2 |
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