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| | Hyperbolic function |
 | | In mathematics, the hyperbolic functions are analogs of the ordinary trigonometric, or circular, functions. |
 | | Hyperbolic functions are also useful because they occur in the solutions of some simple linear differential equations, notably that defining the shape of a hanging cable, the catenary. |
 | | The function sinh x is an odd function, that is symmetric with respect to the origin, and sinh 0 = 0. |
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