1 files changed, 0 insertions, 77 deletions
diff --git a/src/pkg/math/atanh.go b/src/pkg/math/atanh.go
deleted file mode 100644
index 113d5c103..000000000
--- a/src/pkg/math/atanh.go
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package math
-
-// The original C code, the long comment, and the constants
-// below are from FreeBSD's /usr/src/lib/msun/src/e_atanh.c
-// and came with this notice.  The go code is a simplified
-// version of the original C.
-//
-// ====================================================
-// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
-//
-// Developed at SunPro, a Sun Microsystems, Inc. business.
-// Permission to use, copy, modify, and distribute this
-// software is freely granted, provided that this notice
-// is preserved.
-// ====================================================
-//
-//
-// __ieee754_atanh(x)
-// Method :
-//	1. Reduce x to positive by atanh(-x) = -atanh(x)
-//	2. For x>=0.5
-//	            1              2x                          x
-//	atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
-//	            2             1 - x                      1 - x
-//
-//	For x<0.5
-//	atanh(x) = 0.5*log1p(2x+2x*x/(1-x))
-//
-// Special cases:
-//	atanh(x) is NaN if |x| > 1 with signal;
-//	atanh(NaN) is that NaN with no signal;
-//	atanh(+-1) is +-INF with signal.
-//
-
-// Atanh returns the inverse hyperbolic tangent of x.
-//
-// Special cases are:
-//	Atanh(1) = +Inf
-//	Atanh(±0) = ±0
-//	Atanh(-1) = -Inf
-//	Atanh(x) = NaN if x < -1 or x > 1
-//	Atanh(NaN) = NaN
-func Atanh(x float64) float64 {
-	const NearZero = 1.0 / (1 << 28) // 2**-28
-	// special cases
-	switch {
-	case x < -1 || x > 1 || IsNaN(x):
-		return NaN()
-	case x == 1:
-		return Inf(1)
-	case x == -1:
-		return Inf(-1)
-	}
-	sign := false
-	if x < 0 {
-		x = -x
-		sign = true
-	}
-	var temp float64
-	switch {
-	case x < NearZero:
-		temp = x
-	case x < 0.5:
-		temp = x + x
-		temp = 0.5 * Log1p(temp+temp*x/(1-x))
-	default:
-		temp = 0.5 * Log1p((x+x)/(1-x))
-	}
-	if sign {
-		temp = -temp
-	}
-	return temp
-}