99.38 Proof without words: Cotangent expressed as a series of cosecants of multiple angles in powers of two

Publisher: Cambridge University Press

E-ISSN: 2056-6328|99|546|538-538

ISSN: 0025-5572

Source: The Mathematical Gazette, Vol.99, Iss.546, 2015-11, pp. : 538-538

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