Proof Without Words: Cotangent Double Angle Identity

Author: Subramaniam K. B.  

Publisher: Mathematical Association of America

E-ISSN: 1931-1346|46|2|121-121

ISSN: 1931-1346

Source: The College Mathematics Journal, Vol.46, Iss.2, 2015-03, pp. : 121-121

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Abstract