问题
填空题
函数f(x)=
|
答案
因为f(x)=
sinxsin(x+3
)+sin2x=π 2
sinxcosx+3
=1-cos2x 2
sin2x-3 2
cos2x+1 2
=sin(2x-1 2
)+π 6
,x∈[0,1 2
]⇒2x-2π 3
∈[-π 6
,π 6
]⇒sin(2x-7π 6
)∈[-π 6
,1],1 2
故f(x)∈[0,
]3 2
故答案为:[0,
]3 2