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“A Remarkable Formula.” Trigonometric Delights, by Eli Maor, Princeton University Press, PRINCETON; OXFORD, 1998, pp. 139–144, Accessed 27 Jan. 2021.
Maor, E. (1998). A Remarkable Formula. In Trigonometric Delights (pp. 139-144). PRINCETON; OXFORD: Princeton University Press. Retrieved January 27, 2021, from
Maor, Eli. "A Remarkable Formula." In Trigonometric Delights, 139-44. PRINCETON; OXFORD: Princeton University Press, 1998. Accessed January 27, 2021.

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