From GeoGebra Manual
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Feel free to use this sandbox to experiment with wiki syntax. See Help:Contents for details.
Example: test = test

  • Type f(x) = x^2 – 2 x – 1 into the Input Bar and press the Enter-key.
  • Place a new point A on the x-axis (see tool New Point; see command Point).
  • Create point B = (x(A), f'(x(A))) that depends on point A.
  • Select tool Tool Locus.gif and successively click on point B and point A.
  • Drag point A along the x-axis to see point B moving along its locus line.
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