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-- · Experience: United Cerebral Palsy · Location: Stockton. View Sina Sao’s profile on LinkedIn, a professional community of 1 billion members.

Với mỗi góc α (0≤α≤180°) ta xác định một điểm M (x0, y0) trên nửa đường tròn đơn vị sao cho góc ˆxOM x O M ^ =α.Khi đó ta có định nghĩa: +) sin của góc α, kí hiệu là sinα, được xác định bởi: sinα = y0; +) côsin của góc α, kí hiệu là cosα, được xác định bởi: cosα = x0;