Comment #1 on issue 3509 by [email protected]: Math.acosh issues
http://code.google.com/p/v8/issues/detail?id=3509
For large x, acosh(x) = log(x+sqrt(x^2-1)) ~ log(2*x) = log(2) + log(x).
This holds for x such that x^2 - 1 = x^2, or x^2 > 2^53 or x ~> 9.49e7.
Getting accurate values for x near 1 seems a bit more difficult.
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