without Soveraign Power, is but a word, without substance, and cannot
could be simplified to √(x² − 1)? We implicitly assumed √(x + 1)² = (x + 1). And that’s true, if x ≥ − 1, but not for smaller x. Just as we have be careful about how we define arccosh, we have to be careful about how we define square root.
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