1. The problem statement, all variables and given/known data Show that cosh^2(x) = (cosh(2x) - 1)/2 2. Relevant equations cosh(x) = (e^x + e^-x)/2 3. The attempt at a solution I have attempted this multiple times and get the same results every time. Squaring cosh(x) I get 1/4(e^2x + e^-2x +2), which is i believe 1/4(cosh(2x) +2). Maybe i just can't see it but how it that equivalent to the identity above??