Cos²x-sin²x=0 √3sin 5x+cos 5x=0
Cos²x-sin²x=0 cos2x=0 2x=π/2+πn, n ∈ z x=π/4+πn/2, n ∈ Z √3sin5x+cos5x=0|:cos5x √3tg5x+1=0 tg5x=-1/√3 5x=π/6+πn, n ∈ Z x=π/30+πn/5, n ∈ Z