Problem Solving Trick
All the equations and/or expression for Ellipse are also valid for Hyperbola, provided if we replace b2 by -b2.
Number of Normals
In general, four normals can be drawn to the hyperbola from any point and if be the eccentric angles of these four co-normal points.
Problem Solving Trick(s)
a) Sum of the eccentric angles of four co-normal points is an odd multiple of π i.e.
b)If α,β,γ are the eccentric angles of three co-normal points on the hyperbola the normals at which are concurrent, then