Mover los deslizadores para generar las elipses e hipérbolas.

r = 15 (slider from 1 to 30, step 1)
A: (r + 1 / r) / 2
B: (r - 1 / r) / 2
c: x^(2) / A^(2) + y^(2) / B^(2) = 1
ang = 1.5079644737231008 (slider from 0 to π / 2, step (2 * π / 50))
d: (x / cos(ang))^(2) - (y / sin(ang))^(2) = 2