What shape is made by a chain attached at both ends? (math question, see details)

What shape is made by a chain attached at both ends? (math question, see details)
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1 Answer

Answer :

answer:It’s known as a catenary (also here). Mathematically it is the same as the graph of hyperbolic cosine, cosh(x). You are correct that it is not a parabola. The equation has the form y = e^x + e^-x, though I don’t have the exact formula you seek.
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