1 files changed, 0 insertions, 65 deletions
diff --git a/src/pkg/math/tan.go b/src/pkg/math/tan.go
deleted file mode 100644
index a36ebbf44..000000000
--- a/src/pkg/math/tan.go
+++ /dev/null
@@ -1,65 +0,0 @@
-// Copyright 2009 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
-
-
-/*
-	Floating point tangent.
-*/
-
-// Tan returns the tangent of x.
-func Tan(x float64) float64 {
-	// Coefficients are #4285 from Hart & Cheney. (19.74D)
-	const (
-		P0 = -.1306820264754825668269611177e+5
-		P1 = .1055970901714953193602353981e+4
-		P2 = -.1550685653483266376941705728e+2
-		P3 = .3422554387241003435328470489e-1
-		P4 = .3386638642677172096076369e-4
-		Q0 = -.1663895238947119001851464661e+5
-		Q1 = .4765751362916483698926655581e+4
-		Q2 = -.1555033164031709966900124574e+3
-	)
-
-	flag := false
-	sign := false
-	if x < 0 {
-		x = -x
-		sign = true
-	}
-	x = x * (4 / Pi) /* overflow? */
-	var e float64
-	e, x = Modf(x)
-	i := int32(e)
-
-	switch i & 3 {
-	case 1:
-		x = 1 - x
-		flag = true
-
-	case 2:
-		sign = !sign
-		flag = true
-
-	case 3:
-		x = 1 - x
-		sign = !sign
-	}
-
-	xsq := x * x
-	temp := ((((P4*xsq+P3)*xsq+P2)*xsq+P1)*xsq + P0) * x
-	temp = temp / (((xsq+Q2)*xsq+Q1)*xsq + Q0)
-
-	if flag {
-		if temp == 0 {
-			return NaN()
-		}
-		temp = 1 / temp
-	}
-	if sign {
-		temp = -temp
-	}
-	return temp
-}