如图,在底面为直角梯形的四棱锥P-ABCD中AD∥BC,∠ABC=90°,PD⊥平面ABCD,AD=1,AB=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101329392215770/SYS201311031013293922157017_ST/0.png)
,BC=4.
(1)求证:BD⊥PC;
(2)当PD=1时,求此四棱锥的表面积.
考点分析:
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已知向量
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,
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,其中ω>0,且
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,又函数f(x)的图象任意两相邻对称轴间距为
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.
(Ⅰ)求ω的值.
(Ⅱ)设α是第一象限角,且
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,求
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2+y
2=r
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=a•
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+b•
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某三棱锥有五条棱的长度都为2,则当该三棱锥的表面积最大时其体积为
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