New math functions?

[ahecht]

Originally Posted by nehalita

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...)

The hyperbolic cosine cosh(x) = (e^x + e^-x)/2

It is very useful when evaluating certain integrals, but not really used outside of advanced calculus. A good description is here.