若
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=3,tan(α-β)=2,则tan(β-2α)=
.
考点分析:
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有四个关于三角函数的命题:
P
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=
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P
2:∃x、y∈R,sin(x-y)=sinx-siny;
P
3:∀x∈[0,π],
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P
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.
其中假命题的是( )
A.P
1,P
4B.P
2,P
4C.P
1,P
3D.P
2,P
4
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