Question

resolva as inequações trigonométricas considerando 0<x<2pi
a) cosx>0
b)cosx>½
c)senx>½

Answer 1

a) cosx > 0 
    S = {x ∈ R/-π/2 < x < π/2}

b) cosx > 1/2
    S = {x ∈ R/ -π/3 < x < π/3}
c) senx > 1/2
    S = {x ∈ R/π/6 < x < 5π/6}