The curve of a power line suspended from two light poles has a shape defined by f(x) = a cosh(x). The shape is also known as a catenary. The hyperbolic cosine formula is

The curve of a power line suspended from two light poles has a shape defined by f(x) = a cosh(x). The shape is also known as a catenary. The hyperbolic cosine formula is

.5(ex + e-x)

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