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by degamad
198 days ago
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Yep - I'm just not sure if any of those proofs implicitly assume Pythagoras, and haven't thought through them properly. I was initially going to say we know that det R = 1 by using the trigonometric identity cos²x+sin²x=1, but then found out that all the proofs of it seem to assume Pythagoras, and in fact, the identity is called the Pythagorean trigonometric identity. |
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