hyperbolic functions help :(

[jaffa]

Please help me with my maths homework!
using the e^x definitions for sinhx and coshx show that

sinh(x)cosh(y)+cosh(x)sinh(y)=sinh(x+y)


Any help would be very much appreciated!!!!!!
Thank You

[buddy]

where are you stuck?
thnx

[jaffa]

I have just substituted in the sinhxcoshy+coshx... equation the definitions with e^x's or e^y's in. I have now two lots of brakets (....)(....)+(....)(...) all over 2.

I think this is the right first step by don't know what to do next

Thanks

[jaffa]

Solved now Surprised no one could help me my friend said it was easy