A flexible cable always hangs in the shape of a catenarys y = c + a cosh

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A flexible cable always hangs in the shape of a catenary’s y = c + a cosh (x/a), where and are constants and a > 0 (see Figure 4 and Exercise 50). Graph several members of the family of functions y = a cosh(x/a). How does the graph change as varies?
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