4 ms·

www.khanacademy.org

• tptacek 16y ago
  Can't recommend this highly enough. Am using it to teach my 9 year old daughter trig over the summer; I dip into it every other week or so (last week to re-remember polar coordinates, for instance).
  • ctbarna 16y ago
    I applaud you for teaching your daughter trig. Nobody has ever "taught" me trig and I have to constantly (re)look up identities and such.
    • projectileboy 16y ago
      You can derive trig identities yourself using Euler's formula. This is a fun hack, easily worth the couple of hours you'll spend getting to understand it.
• jcw 16y ago
  I've been using this to re-learn Trig, as well as learn Calculus and Linear Algebra. Very easy to follow, and the videos are usually only about ten minutes long.