procedure main()
   write(sin(0))
   write(cos(0))
   write(tan(1))
   write(asin(0.5))
   write(acos(0.5))
   write(atan(0.5))
   write(atan2(5,10.0))
   write(dtor(360))
   write(rtod(1))
   asin(2)
end