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e_atanhl.c (141296) e_atanhl.c (176451)
1
2/* @(#)e_atanh.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
1
2/* @(#)e_atanh.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#ifndef lint
16static char rcsid[] = "$FreeBSD: head/lib/msun/src/e_atanh.c 141296 2005-02-04 18:26:06Z das $";
17#endif
15#include <sys/cdefs.h>
16__FBSDID("$FreeBSD: head/lib/msun/src/e_atanh.c 176451 2008-02-22 02:30:36Z das $");
18
19/* __ieee754_atanh(x)
20 * Method :
21 * 1.Reduced x to positive by atanh(-x) = -atanh(x)
22 * 2.For x>=0.5
23 * 1 2x x
24 * atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
25 * 2 1 - x 1 - x

--- 38 unchanged lines hidden --- 		17
18/* __ieee754_atanh(x)
19 * Method :
20 * 1.Reduced x to positive by atanh(-x) = -atanh(x)
21 * 2.For x>=0.5
22 * 1 2x x
23 * atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
24 * 2 1 - x 1 - x

--- 38 unchanged lines hidden ---