New answers tagged trigonometry
1
I have been teaching trigonometry for many years and, surprisingly, did not know of this issue. I read the responses and the references therein, and I am putting my thoughts on this issue here.
The question is how to approach trigonometry, right triangles first and then unit circle; or circle first and then triangle.
I think the answer depends on the ...
2
Books about middle school algebra and trigonometry written by someone like Gelfand are rare (I don't know other examples; for example V.I. Arnold's books nomially for children are aimed at very special children, their author's claims to the contrary), but there are many undergraduate textbooks written by superb mathematicians. I list below some that occur to ...
0
This may not qualify, as it is a stretch to classify this as a "textbook."
It arose from a series of lecture Klein gave to high-school teachers.
Klein, Felix. Elementary Mathematics from an Advanced Standpoint: Geometry. Transl. from the Third German Ed. by ER Hedrick and CA Noble. Dover, 1939.
I love this (...
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