1. The problem statement, all variables and given/known data Find the inverse Laplace Transform of (9s+5)/(s2-9) given s>3 2. Relevant equations I have a table of Laplace Transforms. it says "sinh at" goes with a/(s2-a2) and "cosh at" goes with s/(s2-a2) 3. The attempt at a solution I know how to split it up and find the inverse Laplace Transform but I don't know what it means by "cosh". I assume it is some variation of cosine? Someone said it means degrees but I don't see how that would change the problem.