Lines Matching full:acosh
978 /* acosh(x)
981 * acosh(x) = log [ x + sqrt(x*x-1) ]
983 * acosh(x) := log(x)+ln2, if x is large; else
984 * acosh(x) := log(2x-1/(sqrt(x*x-1)+x)) if x>2; else
985 * acosh(x) := log1p(t+sqrt(2.0*t+t*t)); where t=x-1.
988 * acosh(x) is NaN with signal if x<1.
989 * acosh(NaN) is NaN without signal.
991 double acosh(double x) {
1005 acosh(huge)=log(2x) */
1008 return 0.0; /* acosh(1) = 0 */
