- #1

- 79

- 0

## Homework Statement

[tex]\frac{dy}{dx} = \frac{cosh x cos y + cosh y sin x}{sinh x sin y - sinh y sin x}[/tex]

I'm really stuck at this one. I don't even know where to start, but I hope that a substitution (ie u = f(x,y)) might be able to put this in a separable form. Any hints please??

Other roads:

1. Hyperbolic cosine/sine identities?

2. Expressing as powers of e?