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Trig-ish

Author:
John Golden
Topic:
Cosine, Sine, Trigonometry
Sam Shah was asking about a cool gif from 1ucasvb (1ucasvb.tumblr.com), and that reminded me (via Jennifer Silverman!) that I had never shared mine. So I made this new one. (It's more fun to make than to find.) Plus some features I never thought of before.

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