How Do You Solve This First Degree ODE Involving Hyperbolic Functions?

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SUMMARY

The discussion focuses on solving the first-degree ordinary differential equation (ODE) given by the formula \(\frac{dy}{dx} = \frac{\cosh x \cos y + \cosh y \sin x}{\sinh x \sin y - \sinh y \sin x}\). Participants suggest using hyperbolic function identities and consider expressing the equation in terms of exponential functions. The equation is identified as exact, leading to the conclusion that the differential form can be manipulated using the relationships between the numerator and denominator.

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  • Understanding of first-degree ordinary differential equations
  • Familiarity with hyperbolic functions and their identities
  • Knowledge of exact equations and their properties
  • Basic skills in manipulating differential forms
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Homework Statement



\frac{dy}{dx} = \frac{cosh x cos y + cosh y sin x}{sinh x sin y - sinh y sin x}

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?
 
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Is there a typo? It's almost exact. The sin x in the numerator looks out of place.
 
This is an exact equation.

dy/dx = Numerator/Denominater

D dx - N dy =0

\partialD/\partialy=\partialN/\partialx

u (nearly)=D dx + N dy
 

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