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## Main Question or Discussion Point

Given the quantity

Cosh(x)*Cosh(y)

where x and y are two indipendent real variables is it possible to write it only in function of

k=Cosech(x)*Cosech(y)

?????

It could seem a quite easy problem but I spent a few days between the proprieties of hyperbolic functions and I really didn't find a way to solve it.

Cosh(x)*Cosh(y)

where x and y are two indipendent real variables is it possible to write it only in function of

k=Cosech(x)*Cosech(y)

?????

It could seem a quite easy problem but I spent a few days between the proprieties of hyperbolic functions and I really didn't find a way to solve it.