Comment #1 on issue 3493 by [email protected]: Math.sinh issues
http://code.google.com/p/v8/issues/detail?id=3493
Possible fix. Won't give you < 1 ulp accuracy, but should solve most of the
glaring errors.
Let D(x) = Math.expm1(x), and assume expm1 is accurate over all floats.
sinh(x) = 1/2*D(x)*(1+1/(D(x)+1))
For |x| > 709.8 (actually log(most-positive-double-float)), this doesn't
work. Instead use
sinh(x) = (0.5*exp(x/2))*exp(x/2).
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