Built to support lectures, examine one Sketchpad with a collection of sketches
      · to remind before introducing functions (support Sketchpads linked),
      · to introduce and explore derivatives from different viewpoints, including
      · plotting antiderivatives from a Reimann Sums point of view and a
      · brief history.

      Yes, it is better if you have a Geometer's Sketchpad and can play while we work.