「関数グラフ」Google検索
「rainbow egg」
「1.2+(sqrt(1-(sqrt(x^2+y^2))^2) + 1 - x^2-y^2) * (sin (10000 * (x*3+y/5+7))+1/4) from -1.6 to 1.6」
「flower」
「100-3/(sqrt(x^2+y^2))+sin(sqrt(x^2+y^2))+sqrt(200-(x^2+y^2)+10*sin(x)+10 sin(y))/1000, x is from -15 to 15, y is from -15 to 15, z is from 90 to 101」