http://dark.lambdaplusjs35padjaiz4jw2fugdoeutse262phqr72uf634s2wdbqd.onion/math/1442
As an example, consider the functions f(x,y) = (5x-3)(5x-4) g(x,y) = (5x+5y-7)(5x-5y-7) h(x,y) = (7x+y-5)(7x-y-5) k(x,y) = (5x-3)(5x-4) + x² + y² - 1 The curves f(x,y)=0, g(x,y)=0, h(x,y)=0, and k(x,y)=0 all intersect the circle at the four points (3/5,±4/5) and (4/5,±3/5).