Intersect command bug
Hyperbola c'_1: 4x y - 3y^2 + 480x - 240y + 244800 = 0 and
hyperbola c'_2: x y - 60x + 60y + 41400 = 0 intersect.
The point (65, -300) satisfies the above two equations.
Geogebra fails to generate that ordered pair, when its command intersect is invoked.