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futilitycloset.com

Tidy - Futility Closet

A visual proof that a² – b² = (a + b)(a – b)

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About Tidy - Futility Closet

Futility Closet is a collection of entertaining curiosities in history, literature, language, art, philosophy, and mathematics, designed to help you waste time as enjoyably as possible.

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by @Micadep