According to your calculus book, a heavy cable or chain suspended between two poles should take the shape of a "catenary," whose formula involves the hyperbolic cosine function. Adjust the sliders for the two constants in the equation below, to see if that appears to be the case for the chain in the picture.

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Photo taken at the Rock and Roll Hall of Fame,
Cleveland, Ohio

Carl Spitznagel, Created with GeoGebra