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函数y=sinx的定义域为[a,b],值域是,则b-a的最大值与最小值之和是( ...
函数y=sinx的定义域为[a,b],值域是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101716579505495/SYS201311031017165795054009_ST/0.png)
,则b-a的最大值与最小值之和是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101716579505495/SYS201311031017165795054009_ST/1.png)
B.2π
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101716579505495/SYS201311031017165795054009_ST/2.png)
D.4π
考点分析:
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下列命题中:
①
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②
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101716579505495/SYS201311031017165795054008_ST/1.png)
;
③函数y=tanx的图象的所有对称中心是(kπ,0),k∈Z;
④函数y=3sin2x的所有对称轴方程为
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.
其中正确命题个数是( )
A.0
B.1
C.2
D.3
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函数y=Asin(ωx+ϕ)在一个周期内的图象如图,此函数的解析式为( )
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A.
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B.
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C.
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D.
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设函数f(x)和g(x)分别是R上的偶函数和奇函数,则下列结论恒成立的是( )
A.f(x)+|g(x)|是偶函数
B.f(x)-|g(x)|是奇函数
C.|f(x)|+g(x)是偶函数
D.|f(x)|-g(x)是奇函数
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若平面四边形ABCD满足
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,则该四边形一定是( )
A.直角梯形
B.矩形
C.菱形
D.正方形
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