Lines Matching defs:acosh
30 /* acosh(x)
33 * acosh(x) = log [ x + sqrt(x * x - 1) ]
35 * acosh(x) := log(x) + ln2, if x is large; else
36 * acosh(x) := log(2x - 1 / (sqrt(x * x - 1) + x)), if x > 2; else
37 * acosh(x) := log1p(t + sqrt(2.0 * t + t * t)); where t = x - 1.
40 * acosh(x) is NaN with signal if x < 1.
41 * acosh(NaN) is NaN without signal.
48 acosh (double x)
68 /* acosh(huge) = log(2x) */
74 /* acosh(1) = 0 */
89 } /* acosh */