V.C = Pow(X+y*10, 2) Plot(X, Y, V)
V.C = Pow(X+y*12, 2) Plot(X, Y, V)
V.C = Pow(Sqr(x+y), 2) Plot(X, Y, V)
V.C = Pow((x-400)*(x-400)+(y-300)*(y-300), 2) Plot(X, Y, V)
