(2007•中山)如图,Rt△ABC的斜边AB=5,cosA=
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,
(1)用尺规作图作线段AC的垂直平分线l(保留作图痕迹,不要求写作法、证明);
(2)若直线l与AB、AC分别相交于D、E两点,求DE的长.
考点分析:
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