I have always been curious as to where the definition of cosh(x) and sinh(x) come from and how they are related to the natural exponential. I know it has something to do with Euler's formula but I don't know the details of the derivation. Could anyone shed some light on this? I haven't yet been formally taught hyperbolic functions.(adsbygoogle = window.adsbygoogle || []).push({});

Math level:Up to Differential Equations

Thanks!!!

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# Hyperbolic Function identities

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