在△ABC中,设A、B、C的对边分别为a、b、c,向量
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=(cosA,sinA),
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=(
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),若|
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|=2.(1)求角A的大小;(2)若
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的面积.
考点分析:
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给出下列四个命题:
①f(x)=sin(2x-
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)的对称轴为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703015_ST/1.png)
;
②函数f(x)=sinx+
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的最大值为2;
③函数f(x)=sinx•cosx-1的周期为2π;
④函数f(x)=sin(2x+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703015_ST/3.png)
)在[0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703015_ST/4.png)
]上的值域为[-
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].
其中正确命题的是
.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703014_ST/images0.png)
如图,已知两个同心圆的半径分别为1、2,P(x
1,y
1),Q(x
2,y
2)是大圆的割线,它与小圆距P最近的公共点是M,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703014_ST/0.png)
的取值范围是
.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703013_ST/images0.png)
如图,一个空间几何体的正视图、侧视图都是面积为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703013_ST/0.png)
,且一个内角为60°的菱形,俯视图为正方形,那么这个几何体的表面积为
.
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等差数列{a
n}中,若a
1+a
2=4,a
10+a
9=36,则S
10=
.
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设{a
n}是等比数列,公比q=
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,S
n为{a
n}的前n项和.记
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102407953770381/SYS201311031024079537703011_ST/1.png)
,n∈N
*,设T
n为数列{T
n}的最大项,则n
=( )
A.3
B.4
C.5
D.6
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