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bsd_source/lib/libc/src_bsd/math/e_acosh.c - 2.0KB - 71 lines

56:             t=x*x;
57:             return log(2.0*x-one/(x+sqrt(t-one)));
58:         } else {                       /* 1<x<2 */
59:             t = x-one;
60:             return log1p(t+sqrt(2.0*t+t*t));
61:         }