\[\boxed{\mathbf{739}\mathbf{.}}\]
\[\lbrack 0;\ 3\pi\rbrack.\]
\[1)\ tg\ x = 3\]
\[x = arctg\ 3 + \pi n.\]
\[x_{1} = arctg\ 3;\]
\[x_{2} = arctg\ 3 + \pi;\]
\[x_{3} = arctg\ 3 + 2\pi.\]
\[2)\ tg\ x = - 2\]
\[x = - arctg\ 2 + \pi n.\]
\[x_{1} = - arctg\ 2 + \pi;\]
\[x_{2} = - arctg\ 2 + 2\pi;\]
\[x_{3} = - arctg\ 2 + 3\pi.\]