Did you put this in exponential form? Remember that the hyperbolic functions are related to the trig functions (I assume you know how, ask if you don't or look it up) and they obey identities that are reminiscent of the trig identities.
Did you put this in exponential form? Remember that the hyperbolic functions are related to the trig functions (I assume you know how, ask if you don't or look it up) and they obey identities that are reminiscent of the trig identities.