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)
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(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======以下答案可供参考======
供参考答案1:
(1) sin378°21'=0.31482087;
cos742.5°=0.9238795; tan1111°=0.6008606;
(2)sin(-879°)=-0.35836795; tan(-33π/8)=-0.4142136; cos(-13π/10) =-0.587785;
(3)sin3=0.14112; cos(sin2)=0.6143003
cos(-根号下2/10)
=0.999969538