Casio fx-CG50 - Hyperbolic functions of complex numbers

[Dands]

Hello,

I recently discovered that my CG50 can't evaluate hyperbolic functions of complex numbers such as

cosh(2*i)

or

sinh(2+2*i)

Giving me a "Non-real ERROR".

It's important to point out that other calculators such as the HP Prime and TI Nspire can do this with no problem. If you're asking yourself why I need this: calculating impedance parameters of power distribution lines.

I tried both rad and deg modes and my calculator is in Complex mode. Latest OS installed.

Any ideas on how why this isn't working? It's a shame because I really expected this calculator to do this.

Thanks