易知最大值为1
当sin(2x+π/6)=1时取得
此时2x+π/6=π/2+2kπ
x=π/6+kπ
易知最小值为-3
当sin(2x+π/6)=-1时取得
此时2x+π/6=-π/2+2kπ
x=-π/3+kπ区间呢？区间y＝2sin(2x+π/6)－1增区间-π/2+2kπ<=2x+π/6<=π/2+2kπ-π/3+kπ<=x<=π/6+kπ减区间π/2+2kπ<=2x+π/6<=3π/2+2kππ/6+kπ<=x<=2π/3+kπ