-108°和-225°怎么化成2kπ+a(0≤a<2π,

问题描述:

-108°和-225°怎么化成2kπ+a(0≤a<2π,

-108°
=2kπ+2π-108°
=2kπ+360°-108°
=2kπ+252°
-108°
=2kπ+2π-225°
=2kπ+360°-225°
=2kπ+135°