1. The problem statement, all variables and given/known data Find all the values of Z which satisfy the equation, Z being a complex number in the form x+i*y. 2. Relevant equations Every trig identity out there. 3. The attempt at a solution Here's what I got so far: Cosh(z) = i*Cos(3) Cosh(x)*Cos(y)+i*(Sinh(x)*Sin(y)) = i*Cos(3) Therefore, Cosh(x)*Cos(y) = 0 Sinh(x)*Sin(y) = i*Cos(3) y = Pi/2 (since there's no value of x which can give Cosh(x) = 0). y may also be Pi/2 + 2nPi, where n is an integer. Therefore, Sinh(x) = i*Cos(3) But I don't know how to proceed from there.