aidez moi a résoudre ces exercices svp

1) Cosx≥-√2/2 ⇔ x∈[-2π;-5π/4]U[-3π/4;3π/4]U[5π/4;2π]

Cosx<1/2 ⇔ x∈]-5π/3;-π/3[U]π/3;5π/3[

Sinx≥√2/2 ⇔ x∈[-7π/4;-5π/4]U[π/4;3π/4]

Sinx<-1/2 ⇔x∈]-5π/6;-π/6[U]7π/6;11π/6[

2) sin(2x-π/3)=1/2 ⇔2x-π/3=π/6 ou 2x-π/3=5π/6 ⇔ x=π/4 ou x=7π/12
S={π/4;7π/12}

cos(x+π/6)=-√3/2 ⇔ x+π/6=5π/6 ou x+π/6=7π/6 ⇔ x=2π/3 ou x=π
S={2π/3;π}

tan(3x-π/2)=1 ⇔ 3x-π/2=π/4 ou 3x-π/2=7π/4 ⇔ x=π/4 ou 3π/4
S={π/4;3π/4}