Toán Lớp 10: Cho A(1;2) B(4;1) C(5;4). Tính góc BAC?
A.30°
B.60°
C.90°
D.45°
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Toán Lớp 10: Cho A(1;2) B(4;1) C(5;4). Tính góc BAC?
A.30°
B.60°
C.90°
D.45°
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