sin1= cos1= sinπ= cosπ= cosπ/2=

问题描述:

sin1= cos1= sinπ= cosπ= cosπ/2=
cosπ/4=
sinπ/4=

sin(1) = 0.8414709848079
cos(1) = 0.54030230586814
sinπ=0
cosπ=-1
cosπ/2=0