tan
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-cot
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的值为
.
考点分析:
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设椭圆
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+
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=1和x轴正方向的交点为A,和y轴的正方向的交点为B,P为第一象限内椭圆上的点,使四边形OAPB面积最大(O为原点),那么四边形OAPB面积最大值为( )
A.
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ab
B.
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ab
C.
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ab
D.2ab
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在等差数列{a
n}中,首项a
1=
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,从第10项起开始大于1,那么此等差数列公差d的取值范围为( )
A.(
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,
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)
B.[
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,
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)
C.[
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,
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]
D.(
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,
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]
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用五个数字0,1,1,2,2组成的五位数总共有( )
A.12个
B.24个
C.30个
D.48个
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在侧棱长为a的正四棱锥中,棱锥的体积最大时底面边长为( )
A.
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a
B.
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a
C.
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a
D.a
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在△OAB中,
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,OD是AB边上的高,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182727515383938/SYS201310241827275153839007_ST/1.png)
则λ等于( )
A.
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B.
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C.
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D.
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