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DIY Pericentric Lens from a Fresnel and an entocentric lens
Author:
optowiki.info (Michael Schaefer)
GeoGebra
New Resources
Basic Percent Exercises (V1)
Experiments with Transformations in the Plane
A note on Erdős’s mysterious remark
seo tool
apec
Discover Resources
sine and arcsin relationship
ellipsecircle
Balistique
final
Nichtvertauschbarkeit der Verknüpfung
a+bsincx & a+bcoscx
Discover Topics
Secant Line or Secant
Random Variables
Logarithmic Functions
Continuity
Conic Sections