Einige Funktionen in zwei Variablen

Plot3D[2  x - 3  y + 4, {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, ImageSize -> 750]

Plot3D[y^2 - x^2, {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, ImageSize -> 750]

Plot3D[x^2 + y^2, {x, -3, 3}, {y, -3, 3}, 
      PlotPoints -> 100, ImageSize -> 750]

Plot3D[Sqrt[9 - x^2 - y^2], {x, -3, 3}, {y, -3, 3}, 
      PlotPoints -> 100, PlotRange -> {0, 3}, 
      ImageSize -> 750]

Plot3D[Exp[-x^2 - y^2], {x, -3, 3}, {y, -3, 3}, 
      PlotPoints -> 100, PlotRange -> {0, 1}, 
      ImageSize -> 750]

Plot3D[Sin[x] + Cos[y], {x, -4 Pi, 4  Pi}, {y, -4 Pi, 4  Pi}, 
      PlotPoints -> 100, PlotRange -> {-2, 2}, 
      ImageSize -> 750]

Plot3D[(x + y)/(x^2 + y^2), {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, PlotRange -> {-10, 10}, 
      ImageSize -> 750]

Plot3D[(x y^2)/(x^2 + y^2), {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, PlotRange -> {-1, 1}, 
      ImageSize -> 750]

Plot3D[Sin[5  x]*Exp[-y], {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, PlotRange -> {-Exp[2], Exp[2]}, 
      ImageSize -> 750]

Plot3D[
      Sin[x]*Sin[y]/(1 + x^2 + y^2), {x, -Pi, Pi}, {y, -Pi, Pi}, 
      PlotPoints -> 100, ImageSize -> 750]

Plot3D[Abs[x] - Abs[y], {x, -2, 2}, {y, -2, 2}, 
      PlotPoints -> 100, ImageSize -> 750]

Plot3D[Log[x] Log[y], {x, 0, 1}, {y, 0, 1}, PlotPoints -> 100, 
      PlotRange -> {0, 10}, ImageSize -> 750]

Plot3D[Sin[Exp[x] + Exp[y]], {x, -3, 3}, {y, -3, 3}, 
      PlotPoints -> 100, PlotRange -> {-1, 1}, 
      ImageSize -> 750]

Plot3D[Tan[x + y/2], {x, -Pi, Pi}, {y, -Pi, Pi}, 
      PlotPoints -> 100, PlotRange -> {-10, 10}, 
      ImageSize -> 750]

Plot3D[(Cos[10  x]*y)/(Exp[y] - x^2), {x, -2, 
        2}, {y, -2, 2}, PlotPoints -> 200, 
      PlotRange -> {-25, 25}, ImageSize -> 750]