1) cos2x = 1 x = (π/2)*n n∈Z
2) 2sinx = -1 x = π(2n-(1/6)) x = π(2n+(7/6))
3) ctg((π/2)-2x) = √3 x = (1/6)(3πn+π) = (π/6)(3n+1)
4) cos((3π/2)+(2x/3)) = 1/2 x = π(3n+(1/4)) x = π(3n+(5/4))
5) cos(π-(5x/6)) = -√3/2 x = (π/5)(12n-1) x = (π/5)(12n+1)
и так далее...