>>796
暇つぶしになんとなく
Do[{
bmp=Graphics[{RGBColor[1,0,0],PointSize[0.02],
Point[{x,x/(x^2+2)}],{RGBColor[0,1,0],
Line[Table[{k,k/(k^2+2)},{k,-10,10,.2}]]},{RGBColor[0,0,1],
Line[Table[{p,(2-x^2) p/(x^2+2)^2+2 x^3/(x^2+2)^2},{p,-10,
10,.2}]]}}];
Show[bmp]},{x,-10,10}]