Question

用弧度制表示下列終邊落在陰影部分的角的集合:

(1)______________________________________;

(2)______________________________________;

(3)______________________________________.

Answer 1

(1){α|-+2kπ＜α＜+2kπ,k∈Z }

(2)S={α|+kπ＜α＜+kπ,k∈Z }

(3)S={α|2kπ＜α＜+2kπ或+2kπ＜α＜(2k+1)π,k∈Z}.