ICME References

Author:H.-J. Elschenbroich. GeoGebra Institut NRW

Talk at the TSG 16, ICME 13: A visual approach to basic concepts of calculus www.funktionenlupe.de (+ curvature + polynomial approximation) www.integrator-online.de (+ volume integrals) elschenbroich@t-online.de

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Proof showing that two times the squares of two numbers with a difference of one is equal to one plus the sum of those two numbers squared.
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