在平面直角坐标系xOy中,已知抛物线y
2=2x的焦点为F,抛物线上一点A的横坐标为1,直线FA与抛物线交于点A、B,求向量
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和
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夹角的大小.
考点分析:
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已知:向量
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,求:cos(α-β).
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若方程
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表示双曲线,则下列方程所表示的椭圆中,与此双曲线有共同焦点的是( )
A.
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B.
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C.
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D.
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定义在R上的函数f(x)既是偶函数又是周期函数.若f(x)的最小正周期是π,且当x∈[0,
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]时,f(x)=sinx,则f(
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)的值为( )
A.-
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B.
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C.-
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D.
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已知等比数列{a
n}中,a
7•a
9=36,且a
5=9,则a
11=( )
A.27
B.4
C.±4
D.
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设x,y都是实数,则“x>|y|”是“x>y”的条件( )
A.充分非必要
B.必要非充分
C.充要
D.既非充分又非必要
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