A:added to
B:added u
C:added i
D:added up to
Tony's uncle has two big____(公司) in China.
已知平面上A.B,C三点共线,且OC→=f(x)OA→+1-2sin(2x+π3)OB→,则对于函数f(x),下列结论中错误的是( )