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\begin{document}

  $ x=a*ch(u)*cos(v)*cos({\phi})

$   y=a*ch(u)*cos(v)*sin({\phi})

 $  z=sh(u)*sin(v)

  $ v=-\pi/2 \div \pi/2

$   {\phi}=0 \div 2*\pi.

     u=const (0 \div \infty).

\end{document}
