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函数y=sin2x是( ) A.最小正周期为2π的偶函数 B.最小正周期为2π的...
函数y=sin2x是( )
A.最小正周期为2π的偶函数
B.最小正周期为2π的奇函数
C.最小正周期为π的偶函数
D.最小正周期为π的奇函数
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,则sin4α的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481523769/SYS201311012252094815237002_ST/1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481523769/SYS201311012252094815237002_ST/3.png)
D.
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已知tanα=3,则2sin
2α+4sinαcosα-9cos
2α的值为( )
A.3
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481523769/SYS201311012252094815237001_ST/1.png)
D.
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化简cos(α-β)cos(β-γ)-sin(α-β)sin(β-γ)为( )
A.sin(α-2β+γ)
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C.cos(α-γ)
D.cos(α-2β+γ)
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已知椭圆C:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481388277/SYS201311012252094813882021_ST/0.png)
(a>b>0)的离心率为
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,短轴一个端点到右焦点的距离为
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.
(Ⅰ)求椭圆C的方程;
(Ⅱ)设直线l与椭圆C交于A、B两点,坐标原点O到直线l的距离为
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求ax
2+2x+1=0(a≠0)至少有一负根的充要条件.
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