问题:
已知2cosA=1,则锐角A的度数是
A.30°
B.45°
C.60°
D.75°
已知2cosA=1,则锐角A的度数是
A.30°
B.45°
C.60°
D.75°
A.30°
B.45°
C.60°
D.75°
参考答案: