I am really not understanding these. For example i have

cosh6x+sinh6x

i know that cosh is 1/2(e^x + e^-x) and sinh is 1/2(e^x - e^-x)

so... what now?

1/2(e^x + e^-x)6x+1/2(e^x - e^-x)6x

??

i know somehow that 6x will be whats raised to it's power of the final answer which is e^6x but how?