已知向量
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)与
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=(
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sin
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102337046449478/SYS201311031023370464494016_ST/3.png)
+cos
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,y)共线,且有函数y=f(x).
(Ⅰ)若f(x)=1,求
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的值;
(Ⅱ)在△ABC中,角A,B,C,的对边分别是a,b,c,且满足2acosC+c=2b,求函数f(B)的取值范围.
考点分析:
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已知x,y,z∈R,有下列不等式:
(1)x
2+y
2+z
2+3≥2(x+y+z);(2)
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;(3)|x+y|≤|x-2|+|y+2|;(4)x
2+y
2+z
2≥xy+yz+zx.
其中一定成立的不等式的序号是
.
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已知
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,
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,则tan(2α-β)=
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已知S
n,T
n分别是等差数列{a
n},{b
n}的前n项和,且
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=
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,(n∈N
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+
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=
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已知函数
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,若f(6-a
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函数f(x)的定义域为D,若存在闭区间[a,b]⊆D,使得函数f(x)满足:①f(x)在[a,b]内是单调函数;②f(x)在[a,b]上的值域为[2a,2b],则称区间[a,b]为y=f(x)的“倍值区间”.下列函数中存在“倍值区间”的有( )
①f(x)=x
2(x≥0);
②f(x)=e
x(x∈R);
③f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102337046449478/SYS201311031023370464494011_ST/0.png)
(x≥0);
④f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102337046449478/SYS201311031023370464494011_ST/1.png)
.
A.①②③④
B.①②④
C.①③④
D.①③
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