Tonight my 15-year-old explained the concept of "reference angle" to me. Is that the approved way to teach trigonometry these days?
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Replying to @stevenstrogatz
The approved way to teach trigonometry these days is plainly inferior to Ptolemy's. The masters generally know best: http://bit.ly/2hsqcWl
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Replying to @MathPrinceps @stevenstrogatz
The best ways of teaching trigonometry have all been known for millennia. Why, then, are popular contemporary approaches so misguided?
12:38 AM - 26 Sep 2017
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