用弧度制表示下列终边落在阴影部分的角的集合:(1);(2);(3).

Question

用弧度制表示下列终边落在阴影部分的角的集合:

(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}.