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的值为
.
考点分析:
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如果函数y=sin2x+acos2x的图象关于直线
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对称,那么a等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224533263908401/SYS201311012245332639084009_ST/1.png)
B.1
C.
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D.-1
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若
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≤x≤
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,则
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的取值范围是( )
A.[-2,2]
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224533263908401/SYS201311012245332639084008_ST/3.png)
C.
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D.
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已知α,β均为锐角,且cos(α+β)<0,则下列结论一定成立的是( )
A.cosα>cosβ
B.sinα>sinβ
C.cosα>sinβ
D.sinα>cosβ
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已知sinα-cosα=sinα•cosα,则sin2α的值为( )
A.2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224533263908401/SYS201311012245332639084005_ST/0.png)
-2
B.1-
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C.2-2
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D.
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-1
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