Question

Determine o valor de y, sabendo que y = sen30 - cos60 / tg30

Answer 1

y = sen30 - cos60 / tg30        

tg 30 = sen 30 / cos 30 = (1/2):(√3/2) = (1/2) . (2/√3) 
tg 30 = 1/√3

y = sen30 - cos60 .√3
y=(1/2) - (√3/2)
y=(1-√3)/2