All the stuff before with I'm fine on but I'm confused on "translating this line along the radius through a distance until it falls on the original two circles" as it says in the link or "translate further so that it actually becomes tangent to the 2 circles" as you described. I'm looking for...
How do you find the equation of the (sometimes 2 possible) tangent lines between two (or more) circles? like the 2 tangents that cross in the picture on this page: http://mathworld.wolfram.com/Circle-CircleTangents.html.
The application for this is for a program that would draw this tangent...
Homework Statement
Suppose the columns of A are not independent. How could you find a matrix B so that P=B(BTB)^-1BT does give the projection onto the column space of A? (The usual formula will fail when AT A is not invertible).
T is transpose.
Homework Equations
The Attempt at a Solution
I...