f(x)=cos(2x+
π
3)=sin(2x+
5π
6),
故把g(x)=sin(2x+
π
3)的图象向左平移[π/4]个单位,即得函数f(x)=sin[2(x+
π
4)+
π
3]的图象,
即得到函数f(x)=cos(2x+
π
3)的图象.
故选 C.
f(x)=cos(2x+
π
3)=sin(2x+
5π
6),
故把g(x)=sin(2x+
π
3)的图象向左平移[π/4]个单位,即得函数f(x)=sin[2(x+
π
4)+
π
3]的图象,
即得到函数f(x)=cos(2x+
π
3)的图象.
故选 C.