用计算机求（1）sin378°21',cos742.5°,tan1111°（2）sin(-879°),tan(-33π/8）,
问题描述：
用计算机求（1）sin378°21',cos742.5°,tan1111°（2）sin(-879°),tan(-33π/8）,
cos(-13π/10) (3)sin3,cos(sin2)
cos(-根号下2/10)
答
(1)
sin378°21'=0.314820866
cos742.5°=0.923879532
tan1111°=0.600860619
(2)
sin(-879°)=-0.358367949
tan(-33π/8)=-0.414213562
cos(-13π/10)=-0.587785252
(3)
sin3=0.052335956
cos(sin2)=0.999999814
cos(-根号下2/10)=0.999969538