若
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,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335099852/SYS201311031027563350998003_ST/1.png)
,则sinθ( )
A.{b
n}
B.S
nC.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335099852/SYS201311031027563350998003_ST/3.png)
考点分析:
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下列命题中正确的是( )
A.若命题p为真命题,命题q为假命题,则命题“p∧q”为真命题
B.命题“若xy=0,则x=0”的否命题为:“若xy=0,则x≠0”
C.“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335099852/SYS201311031027563350998002_ST/0.png)
”是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335099852/SYS201311031027563350998002_ST/1.png)
”的充分不必要条件
D.命题“∀x∈R,2
x>0”的否定是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335099852/SYS201311031027563350998002_ST/2.png)
”
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已知集合A={1,2,3,4,5},B={(x,y)|x∈A,y∈A,x-y∈A},则B中所含元素的个数为( )
A.3
B.6
C.8
D.10
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515021_ST/images0.png)
如图,已知OPQ是半径为1,圆心角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515021_ST/0.png)
的扇形,C是扇形弧上的动点,ABCD是扇形的内接矩形.记∠COP=α,求当角α取何值时,矩形ABCD的面积最大?并求出这个最大面积.
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/0.png)
图象关于点B
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/1.png)
对称,点B到函数y=f(x)图象的对称轴的最短距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/2.png)
.
(1)求A,ω,ϕ的值;
(2)若0<θ<π,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/3.png)
的值.
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