在直角坐标平面内,已知点A(2,0),B(-2,0),P是平面内一动点,直线PA、PB斜率之积为-
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.
(Ⅰ)求动点P的轨迹C的方程;
(Ⅱ)过点(
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,0)作直线l与轨迹C交于E、F两点,线段EF的中点为M,求直线MA的斜率k的取值范围.
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