(文)已知动圆过定点P(0,1),且与定直线y=-1相切. (1)求动圆圆心的轨迹M的方程; (2)设过点Q(0,-1)且以 a =(-1,-k) 为方向向量的直线l与轨迹M相交于A、B两点.若∠APB为钝角,求直线l斜率的取值范围.
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