若
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,则tanα的值等于
.
考点分析:
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若关于x的不等式a≤
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-3x+4≤b的解集恰好是[a,b],则a+b的值为( )
A.5
B.4
C.
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D.
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已知A,B,P是双曲线
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上不同的三点,且A,B连线经过坐标原点,若直线PA,PB的斜率乘积
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,则该双曲线的离心率为( )
A.
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B.
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C.
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D.
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已知M是△ABC内的一点,且
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=2
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,∠BAC=30°,若△MBC,△MCA和△MAB的面积分别为
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,x,y,则
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+
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的最小值是( )
A.20
B.18
C.16
D.9
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函数f(x)=sin(ωx+ϕ)(x∈R)
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的部分图象如图所示,如果
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,且f(x
1)=f(x
2),则f(x
1+x
2)=( )
A.
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B.
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C.
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D.1
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设变量x,y满足约束条件
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,则s=
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的取值范围是( )
A.[1,
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]
B.[
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,1]
C.[1,2]
D.[
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,2]
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