This is an updated version of a story first published on May 5, 2024. For many high school students returning to class, it may seem like geometry and trigonometry were created by the Greeks as a form ...
https://doi.org/10.4169/college.math.j.44.1.047 https://www.jstor.org/stable/10.4169/college.math.j.44.1.047 Summary A visual proof of the tangent double angle ...
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