A catenary is a curve formed by a hanging flexible chain or cable that is supported at its ends and acted upon by a uniform gravitational force. The shape of the catenary is described mathematically by the hyperbolic cosine function, and it is often seen in various engineering and architectural contexts, such as in the design of arches, bridges, and overhead power lines.
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A catenary is a curve of the form . It is the equilibrium shape of a uniform flexible chain in a uniform gravitational field.