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bsd_source/lib/libc/src_bsd/math/e_acoshf.c - 1.4KB - 45 lines

39:             t=x*x;
40:             return logf((float)2.0*x-one/(x+sqrtf(t-one)));
41:         } else {                       /* 1<x<2 */
42:             t = x-one;
43:             return log1pf(t+sqrtf((float)2.0*t+t*t));
44:         }