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Nov 10, 2017 at 14:25 comment added Dennis It's just a mnemonic. H is halve, so is unhalve. ÆA is arccosine, so ÆẠ is unarccosine.
Nov 10, 2017 at 14:21 comment added Mr. Xcoder ಠ_ಠ Unhalve... Isn't that just Double?
Nov 10, 2017 at 14:17 history edited Dennis CC BY-SA 3.0
added 600 characters in body
Nov 10, 2017 at 14:00 history answered Dennis CC BY-SA 3.0