hipérbola elipse 3d
u=x(B) – x(A) v=y(B) – y(A) h(x,y)=u² / y² –1 m(x,y)=1 - v² / y²
k(x,y)=x(A)² + y(A)² - x(B)² - y(B)² - y²
i(x,y)=u k(x, y) / y² + 2x(B) n(x,y)=v k(x, y) / y² + 2y(B) l(x,y)=2u v / y²
f(x,y)=Función[sqrt(h(x, y) / m(x, y) x² + i(x, y) / m(x, y) x + k(x, y)² / (4y² m(x, y)) - (x(B)² + y(B)²) / m(x, y) + (n(x, y) + l(x, y) x)² / (4m(x, y)²)) + (n(x, y) + l(x, y) x) / (2m(x, y)), -9, 9, 0, 9]