sin(-930°)怎么算?
问题描述：
sin(-930°)怎么算?
答
sin(-930°)
=sin(3×360°-930°)
=sin150°
=1/2
答
sin(-930°)
=sin(-930°+1080°)
=sin(150°)
=sin(180°-30°)
=sin30°
=1/2