2.已知函數(shù)
f
(
x
)
=
4
sin
(
ωx
+
φ
)
+
1
(
ω
>
0
,
|
φ
|
<
)
,滿足對(duì)?x∈R,f(x
1)≤f(x)≤f(x
2)恒成立的|x
1-x
2|的最小值為
,且對(duì)任意x均有
恒成立.則下列結(jié)論正確的有
.
①函數(shù)y=f(x)的圖像關(guān)于點(diǎn)
對(duì)稱;
②函數(shù)y=f(x)在區(qū)間
上單調(diào)遞減;
③函數(shù)y=f′(x)在
上的值域?yàn)?div dealflag="1" class="MathJye" mathtag="math">
;