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b) Vẽ đồ thị hàm số trên. Tính cos B, cos C. Điểm M di chuyển trên nửa đường tròn. a) Chứng minh rằng tam giác CDN là tam giác cân. b) Chứng minh rằng AC là tiếp tuyến của nửa đường trò[r]
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