- #1

quasar987

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[tex]cos(x)=\frac{e^{ix}+e^{-ix}}{2}[/tex]

[tex]sin(x)=\frac{e^{ix}-e^{-ix}}{2i}[/tex]

That explains the "cos" and "sin" part in "cosh" and "sinh", but what does the "h" (hyperbolic) part comes from?