Question

1.若a是第四象限角,则π+a是第______象限角.

Answer 1

1.第二象限

2.{x|x=2nπ+π/3}

3.1/2

4.选3.4

5.α∈（0,π/2）,=1/5

α∈（π/2,π）,=-1/5

6.[-1,1]

7.[3/2,7/3]

8.(0,5π/12)

9.-1