Lines Matching defs:acosh
30 #pragma weak __acosh = acosh
34 * acosh(x)
37 * acosh(x) = log [ x + sqrt(x*x-1) ]
39 * acosh(x) := log(x)+ln2, if x is large; else
40 * acosh(x) := log(2x-1/(sqrt(x*x-1)+x)) if x > 2; else
41 * acosh(x) := log1p(t+sqrt(2.0*t+t*t)); where t = x-1.
44 * acosh(x) is NaN with signal if x < 1.
45 * acosh(NaN) is NaN without signal.
58 acosh(double x) {
82 } else /* acosh(huge)=log(2x) */
85 return (0.0); /* acosh(1) = 0 */