The usual trigonometry is overly complicated, inaccurate and logically dubious. This is the first of a series that shows you a better way—rational trigonometry! Rational trigonometry replaces distance and angle with more algebraic notions called quadrance and spread. All of those complicated formulas become much simpler, you don’t need a calculator any more, and the theory extends Euclidean geometry to arbitrary fields! What mathematics teacher or student could ask for more? Assoc. Prof. NJ Wildberger from UNSW is also the creator of the MathFoundations series, the WildLinAlg series, and a more advanced video series on Algebraic Topology. Enjoy!
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