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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).



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.


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.




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