cos3分之根号3是多少?

题目

cos3分之根号3是多少?
是多少度？

答案

cos((3^0.5)/3)
=cos(1/(3^0.5))
=cos(0.57735)
=cos(0.57735*180/PI)
=cos(33.08)
=0.83791
ARC COS(0.83791)=33.08度