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Eccentricity and directrix in an ellipse
Author:
Nguyễn Quang Tân
Topic:
Ellipse
GeoGebra
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Poorly Drawn Parallelograms 2
探究由平行線和截線所成的角
Variation Theory Parallelogram Proofs
alg2_05_05_01_applet_exp_flvs
Poorly Drawn Parallelograms 3
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