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A Finger Trick for Trigonometry (Tanton: Mathematics)

If we insist that students memorise the values of sine and cosine for the basic angles 0, 30, 45, 60 and 90 degrees, then here's a cute little trick for doing so using the fingers on your hand. (Notice: This all goes against my principles of as a mathematician - memorisation is joyless! But I do admit this finger trick is cute!)
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