三角函数习题

y=sin[5x+(π/6)] (x∈R)

2kπ≤5x+(π/6)≤2kπ+2π

2kπ/5-π/30≤x≤2kπ/5+11π/30

5x+(π/6)=2kπ+π/2

x=2kπ/5+π/15

因此,函数周期[2kπ/5-π/30,2kπ/5+11π/30],最大值1,最小值-1,对称轴x=2kπ/5+π/15

y=2sin(1/6x) (x∈R)

2kπ≤x/6≤2kπ+2π

12kπ≤x≤12(k+1)π

x/6≤2kπ+π/2

x=12kπ+3π

因此,函数周期[12kπ,12(k+1)π],最大值2,最小值-2,对称轴x=12kπ+3π