Cho(O,R)đường kính AB cố định còn đường kính CD thay đổi, xy là tiếp tuyến tại B, cắt AC và AD tạiP,Q

a, Chứng minh tứ giác CPQD nội tiếp

b. Chứng minh trung tuyến AIcủa tam giácAQP vuông góc với DC

c,Tìm tập hợp tâm E của đường tròn ngoại tiếp tam giác CPD

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