1.最大值y=5,{x=2kπ-π/2,k∈Z}最小值y= -5,{x=2kπ+π/2,k∈Z} 2.最大值y= 3/2,,{x=2kπ-π/2,k∈Z}最小值y= -3/2,,{x=2kπ+π/2,k∈Z} 3.最大值3,2x+π/3=2kπ+π/2.,x=kπ+π/12.∴集合为{x=kπ+π/12,k∈Z}最小值-3,2x+π/3=2kπ-π/2.,x=kπ-5π/12,.∴集合为{x=kπ-5π/12,k∈Z} 4.最大值1/2,x/2+π/4=2kπ+π/2,x=4kπ+π/2,.∴集合为{x=4kπ+π/2,k∈Z}最小值 -1/2,x/2+π/4=2kπ-π/2,x=4kπ-3π/2,,.∴集合为{x=4kπ-3π/2,k∈Z}... |