New math functions?

[nehalita]

Originally Posted by Anthony Kesich

They are (straight from math.h):
float cos (float x);
float cosh (float x);
-Tony K

Quick question: I looked up the difference between cos and cosh and it says that cosh was the hyperbolic cosine. What is a hyperbolic cosine and when would it be helpful to use it? (wow i think I've ended every post I've done here with a confused face...)