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cos²x +sin²x =1 (Pythagora in the unit circle)
Author:
Daniel Mentrard
Topic:
Circle
,
Cosine
,
Sine
,
Trigonometry
,
Unit Circle
http://dmentrard.free.fr/GEOGEBRA/Maths/cossincarreMD.html
http://dmentrard.free.fr/GEOGEBRA/Maths/cossincarreMD.html
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bewijs stelling van Pythagoras
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