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diff --git a/src/pkg/math/cmplx/sqrt.go b/src/pkg/math/cmplx/sqrt.go
deleted file mode 100644
index 4ef6807ad..000000000
--- a/src/pkg/math/cmplx/sqrt.go
+++ /dev/null
@@ -1,104 +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 cmplx
-
-import "math"
-
-// The original C code, the long comment, and the constants
-// below are from http://netlib.sandia.gov/cephes/c9x-complex/clog.c.
-// The go code is a simplified version of the original C.
-//
-// Cephes Math Library Release 2.8:  June, 2000
-// Copyright 1984, 1987, 1989, 1992, 2000 by Stephen L. Moshier
-//
-// The readme file at http://netlib.sandia.gov/cephes/ says:
-//    Some software in this archive may be from the book _Methods and
-// Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster
-// International, 1989) or from the Cephes Mathematical Library, a
-// commercial product. In either event, it is copyrighted by the author.
-// What you see here may be used freely but it comes with no support or
-// guarantee.
-//
-//   The two known misprints in the book are repaired here in the
-// source listings for the gamma function and the incomplete beta
-// integral.
-//
-//   Stephen L. Moshier
-//   moshier@na-net.ornl.gov
-
-// Complex square root
-//
-// DESCRIPTION:
-//
-// If z = x + iy,  r = |z|, then
-//
-//                       1/2
-// Re w  =  [ (r + x)/2 ]   ,
-//
-//                       1/2
-// Im w  =  [ (r - x)/2 ]   .
-//
-// Cancellation error in r-x or r+x is avoided by using the
-// identity  2 Re w Im w  =  y.
-//
-// Note that -w is also a square root of z.  The root chosen
-// is always in the right half plane and Im w has the same sign as y.
-//
-// ACCURACY:
-//
-//                      Relative error:
-// arithmetic   domain     # trials      peak         rms
-//    DEC       -10,+10     25000       3.2e-17     9.6e-18
-//    IEEE      -10,+10   1,000,000     2.9e-16     6.1e-17
-
-// Sqrt returns the square root of x.
-// The result r is chosen so that real(r) ≥ 0 and imag(r) has the same sign as imag(x).
-func Sqrt(x complex128) complex128 {
-	if imag(x) == 0 {
-		if real(x) == 0 {
-			return complex(0, 0)
-		}
-		if real(x) < 0 {
-			return complex(0, math.Sqrt(-real(x)))
-		}
-		return complex(math.Sqrt(real(x)), 0)
-	}
-	if real(x) == 0 {
-		if imag(x) < 0 {
-			r := math.Sqrt(-0.5 * imag(x))
-			return complex(r, -r)
-		}
-		r := math.Sqrt(0.5 * imag(x))
-		return complex(r, r)
-	}
-	a := real(x)
-	b := imag(x)
-	var scale float64
-	// Rescale to avoid internal overflow or underflow.
-	if math.Abs(a) > 4 || math.Abs(b) > 4 {
-		a *= 0.25
-		b *= 0.25
-		scale = 2
-	} else {
-		a *= 1.8014398509481984e16 // 2**54
-		b *= 1.8014398509481984e16
-		scale = 7.450580596923828125e-9 // 2**-27
-	}
-	r := math.Hypot(a, b)
-	var t float64
-	if a > 0 {
-		t = math.Sqrt(0.5*r + 0.5*a)
-		r = scale * math.Abs((0.5*b)/t)
-		t *= scale
-	} else {
-		r = math.Sqrt(0.5*r - 0.5*a)
-		t = scale * math.Abs((0.5*b)/r)
-		r *= scale
-	}
-	if b < 0 {
-		return complex(t, -r)
-	}
-	return complex(t, r)
-}