[m]\left\{\begin {matrix}tg^2x=\frac{1}{3}\\sinx ≠-\frac{1}{2}\end {matrix}\right.[/m]
[m]\left\{\begin {matrix}tgx= ± \frac{1}{\sqrt{3}}\\sinx ≠-\frac{1}{2}\end {matrix}\right.[/m]
[m]\left\{\begin {matrix}tgx= -\frac{\sqrt{3}}{3}\\sinx ≠-\frac{1}{2}\end {matrix}\right.[/m] или [m]\left\{\begin {matrix}tgx= \frac{\sqrt{3}}{3}\\sinx ≠-\frac{1}{2}\end {matrix}\right.[/m]