f(x)=2sin(2x-π/3)=======＞y=cosx 怎么变?

f(x)=2sin(2x-π/3)=======＞y=cosx 怎么变?
f(x)=2sin(2x-π/3)=======＞y=cosx 怎么变?

f(x)=2sin(2x-π/3)=======＞y=cosx 怎么变?
f(x)=2cos[π-(2x-π/3)]
=2cos(-2x+2π/3)
=2cos(2x-2π/3)
=2cos[2(x-π/3)]
所以向左π/3个单位
横坐标变成原来的2
纵坐标变成原来的2倍