(- 1 1π/4)=θ+2kπ
θ=(- 1 1π/4)-2kπ
When k=- 1
θ=-3π/4
four
When k=0
0≤α≤π
-2π≤α≤-π
five
Counterclockwise is positive and clockwise is negative.
2kπ+(π/4)≤α≤2kπ+2π-(π/3)
2kπ+(π/4)≤α≤2kπ+(5π/3)