Question

determine o valor de y = sen 30° - cos 45°/tg 30° + cos 60° + sen 45°/tg 60°

Answer 1

sen30º= 1/2; sen e cos45°= √2/2¯; tg30°=√3/3¯; cos60°= 1/2; Assim temos:
1/2- √2/2¯/√3/3+1/2+ √2/2¯
1/2-3√2/3√2+1/2+√2/2=
1/2-1+1/2+√2/2 ( tirando o MMC)=  1-2+1+ √2/2= √2/2