0
sinx=1,ymin=a-b=-1/2
ymax=a+b=3/2
a=1/2,b=1
y=-2sin(2x+π/3)
2x+π/3=2kπ+π/2,x=kπ+π/12,y最小=-2
2x+π/3=2kπ-π/2,x=kπ-5π/12,y最大=2
0
sinx=1,ymin=a-b=-1/2
ymax=a+b=3/2
a=1/2,b=1
y=-2sin(2x+π/3)
2x+π/3=2kπ+π/2,x=kπ+π/12,y最小=-2
2x+π/3=2kπ-π/2,x=kπ-5π/12,y最大=2