set zeroaxis
set xrange[0:5]
set yrange[-20:150]
set nokey
set title 'Grafico della funzione $x^3$'
set xtics -1,1,10
set ytics -20,10,140
set arrow from 2,8 to 4,64 nohead
set label '$[x_1,f(x_1)]$' at 2,8      
set label '$[x_2,f(x_2)]$' at 4,64    
set xlabel '$x$'
set ylabel '$y$'
plot x**3
set terminal latex
set output "c:\\uno.tex"
replot