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如图所示，F 1 、F 2 分别是椭圆 的左、右焦点，M为椭圆上一点，MF 2 垂直于x轴，且OM与椭圆长轴和短轴端点的连线AB平行． （1）求椭圆的离心率； （2）过F 2 有与OM垂直的直线交椭圆于P、Q两点，若 ，求椭圆的方程．
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