One has to feel a bit sorry for the Law of Cosines inasmuch as the Pythagorean theorem is simply a special case, but it’s the PT that everyone knows and gets all the attention. Are there other theorems that are relatively unknown but have well-known special cases?
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E=sqrt(p^2 c^2 + m^2 c^4)
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I know it can be done more or less consistently, I still don't like it :D
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