PROOF OF THE SUM AND DIFFERENCE FORMULAS IN TRIGONOMETRY

Autor:	Hickerson, T. F.
Zdroj:	Journal of the Elisha Mitchell Scientific Society, 1955 Nov 01. 71(2), 181-184.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/24334457 Zobrazit plný text záznamu