y=-2sin(x+π/6)+3
x屬于R
所以 x+π/6屬于R
最大值=5 x+π/6=2kπ-π/2 x=2kπ-2π/3
最小值=1 x+π/6=2kπ+π/2 x=2kπ+π/3
2 x屬于[0,π]
x+π/6 屬于[π/6,7π/6]
最大值=4 x+π/6=7π/6 x=π
最小值=1 x+π/6=π/2 x=π/3
3 x屬于[-π/2,π/2]
x+π/6屬于[-π/3,2π/3]
最大值=3+根號下3 x+π/6=-π/3 x=-π/2
最小值=1 x+π/6=π/2 x=π/3