sin²(x)+cos²(x)=1

http://dmentrard.free.fr/GEOGEBRA/Maths/cosincarreMD.html
[url=http://dmentrard.free.fr/GEOGEBRA/Maths/cosincarreMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/cosincarreMD.html[/url]
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Information: sin²(x)+cos²(x)=1