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直线2xcosα-y-3=0(α∈[,])的倾斜角的变化范围是( ) A.[,]...
直线2xcosα-y-3=0(α∈[
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,
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])的倾斜角的变化范围是( )
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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