Einfache Grafiken

f[x_] := x^3 - x

p = Plot[f[x],  {x, -3, 3}]

?? Plot

p2  =  Plot[x^2, {x, -4, 4}]

Show[p, p2,  AxesLabel ->  {"x-Achse", "y-Achse"},  
      Frame -> True,  AspectRatio -> 1]