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A comment on A visual proof that a^2 – b^2 = (a + b)(a – b). Parent comment

Re:A visual proof that a^2 – b^2 = (a + b)(a – b) by stephencanon on Sunday December 15, 2024 @10:04AM (#42423782)
The purely geometric proof works just fine without the case analysis if you use the oriented area.
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