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International Journal of Mathematics and Mathematical Sciences 
Volume 10 (1987), Issue 3, Pages 545-549
doi:10.1155/S0161171287000656

Consequences of a sextuple-product identity

John A. Ewell

Department of Mathematical Sciences, Northern Illinois University, DeKalb 60115, Illinois, USA

Received 28 March 1986

Abstract

A sextuple-product identity, which essentially results from squaring the classical Gauss-Jacobi triple-product identity, is used to derive two trigonometrical identities. Several special cases of these identities are then presented and discussed.