问题
选择题
sin600°的值为 ( )
|
答案
sin600°
=sin(2×360°-120°)
=sin(-120°)
=-sin120°
=-sin(180°-60°)
=-sin60°
=-
.3 2
故选C
sin600°的值为 ( )
|
sin600°
=sin(2×360°-120°)
=sin(-120°)
=-sin120°
=-sin(180°-60°)
=-sin60°
=-
.3 2
故选C