If the curves x2a2+y2b2=1 and x225+y216=1 cut each other orthogonally, then a2−b2=
If the curves x2a2+y2b2=1 and x2l2−y2m2=1 cut each other orthogonally, then
If the curves x2a2+y2b2=1 and x2α2+y2β2=1 cut each other orthogonally,