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已知方程x2+y2+kx+2y+k2=0所表示的圆有最大的面积,则直线y=(k-...
已知方程x2+y2+kx+2y+k2=0所表示的圆有最大的面积,则直线y=(k-1)x+2的倾斜角α= .
考点分析:
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,复数z满足
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,则复数z的模为
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已知O为平面上的一个定点,A、B、C是该平面上不共线的三个动点,点P满足条件
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,则动点P的轨迹一定通过△ABC的( )
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B.垂心
C.外心
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设集合A={(x,y)||x|+|y|≤1},B={(x,y)|(y-x)(y+x)≤0},M=A∩B,若动点P(x,y)∈M,则x
2+(y-1)
2的取值范围是( )
A.
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B.
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C.
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D.
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给出下列的四个式子:①
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,②
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,③
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,④
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;已知其中至少有两个式子的值与tanθ的值相等,则( )
A.a=cos2θ,b=sin2θ
B.a=sin2θ,b=cos2θ
C.
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D.
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