根据题意能画出图来.我不画了.圆O:x^2+y^2=16与x轴交于A,B,l1,l2是分别过A,B的圆的切线,过圆上另一点P(不与A,B重合)作圆的切线,分别交L1,L2于C,D,且AD,BC两直线的交点为M,当P运动时,求动点M的轨
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