Question

indique o sinal das expressões :

Answer 1

16a) sen pi/3 = sen 180/3 = sen 60 = \/3/2
sen 2pi = 0
sen pi/4 = sen 45 = \/2/2

(\/3/2 + 0) / \/2/2 = 
\/3/2 / \/2/2 = 
\/3/2 . 2/ \/2 = 
2\/3 / 2\/2 = \/3/\/2 = (\/3.\/2) / (\/2.\/2) = \/6/2

A letra b pode ser resolvida de modo similar.