Need help with a horrible integral!! Dont get scared 1. The problem statement, all variables and given/known data Prove that 2. Relevant equations Cosh2-Sinh2=1 3. The attempt at a solution I have used the subsitution r=2GM/c2Cosh2(x) and the integral is simplified to: 4GM/c2*[tex]\int[/tex]Cosh2(x)dx Integrating was done in Mathematica but I can't do the simplification needed for the equation to look like the answer.