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asinh
Inverse hyperbolic sine.SYNOPSIS:
double x, y, asinh();
y = asinh(x);
DESCRIPTION:
Returns the inverse hyperbolic sine of an argument.
If |x| < 0.5, the function is approximated by a rational form x + x**3 P(x)/Q(x).
Otherwise, asinh(x) = log(x + sqrt(1 + x*x)).
ACCURACY:
Relative error:
arithmetic domain # trials peak rms
DEC -3,3 75000 4.6e-17 1.1e-17
IEEE -1,1 30000 3.7e-16 7.8e-17
IEEE 1,3 30000 2.5e-16 6.7e-17