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如果f′(x)是二次函数,且f′(x)的图象开口向上,顶点坐标为(1,-),那么...
如果f′(x)是二次函数,且f′(x)的图象开口向上,顶点坐标为(1,-
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),那么曲线y=f(x)上任一点的切线的倾斜角α的取值范围是( )
A.(0,
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]
B.[0,
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)∪[
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,π)
C.[0,
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]∪[
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,π)
D.[
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,
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]
考点分析:
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A.3
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(文)若一条直线与平面所成的角为
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]
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