Trigonometric Addition Formula(proof without word)

http://dmentrard.free.fr/GEOGEBRA/Maths/Export5/AddtrigoformMD.html
[url=http://dmentrard.free.fr/GEOGEBRA/Maths/Export5/AddtrigoformMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/Export5/AddtrigoformMD.html[/url]
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Informatie: Trigonometric Addition Formula(proof without word)