In his book, Divine Proportions, N. J. Wildberger advocates for a "rational" trigonometry by substituting the squares of the common trigonometric ratios for those ratios themselves. This presentation examines and critiques the claims of the book by evaluating its presented methods.
Lestmann, Phillip, "Trigonometry Without Sines and Geometry Without Angles" (2007). ACMS Conference Proceedings 2007. 13.
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