y=2sin(2x+π/3)+1
=2sin[2(x+π/6)]+1
向左平移π/6个单位:
y=2sin[2(x+π/6+π/6)]+1
=2sin(2x+2π/3)+1
再向上平移3个单位:
y=2sin(2x+2π/3)+1+3
=2sin(2x+2π/3)+4