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“$\Left( {{e^x} {e^{ - x}}} \Right)/2:$: The Hanging Chain.” "e": The Story of a Number, by Eli Maor, Princeton University Press, PRINCETON; OXFORD, 1994, pp. 140–146, Accessed 24 Jan. 2021.
Maor, E. (1994). $left( {{e^x} {e^{ - x}}} right)/2:$: The Hanging Chain. In "e": The Story of a Number (pp. 140-146). PRINCETON; OXFORD: Princeton University Press. Retrieved January 24, 2021, from
Maor, Eli. "$left( {{e^x} {e^{ - X}}} right)/2:$: The Hanging Chain." In "e": The Story of a Number, 140-46. PRINCETON; OXFORD: Princeton University Press, 1994. Accessed January 24, 2021.

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