math: update special-conditions comments to use ± symbol
R=rsc, golang-dev, r
CC=golang-dev
https://golang.org/cl/5445046
diff --git a/src/pkg/math/abs.go b/src/pkg/math/abs.go
index eb3e4c7..4c6297c 100644
--- a/src/pkg/math/abs.go
+++ b/src/pkg/math/abs.go
@@ -7,8 +7,7 @@
// Abs returns the absolute value of x.
//
// Special cases are:
-// Abs(+Inf) = +Inf
-// Abs(-Inf) = +Inf
+// Abs(±Inf) = +Inf
// Abs(NaN) = NaN
func Abs(x float64) float64 {
switch {
diff --git a/src/pkg/math/asinh.go b/src/pkg/math/asinh.go
index c1cad56..d697946 100644
--- a/src/pkg/math/asinh.go
+++ b/src/pkg/math/asinh.go
@@ -33,8 +33,7 @@
// Asinh(x) calculates the inverse hyperbolic sine of x.
//
// Special cases are:
-// Asinh(+Inf) = +Inf
-// Asinh(-Inf) = -Inf
+// Asinh(±Inf) = ±Inf
// Asinh(NaN) = NaN
func Asinh(x float64) float64 {
const (
diff --git a/src/pkg/math/floor.go b/src/pkg/math/floor.go
index babbf64..8de4d7e 100644
--- a/src/pkg/math/floor.go
+++ b/src/pkg/math/floor.go
@@ -7,8 +7,7 @@
// Floor returns the greatest integer value less than or equal to x.
//
// Special cases are:
-// Floor(+Inf) = +Inf
-// Floor(-Inf) = -Inf
+// Floor(±Inf) = ±Inf
// Floor(NaN) = NaN
func Floor(x float64) float64 {
// TODO(rsc): Remove manual inlining of IsNaN, IsInf
@@ -30,16 +29,14 @@
// Ceil returns the least integer value greater than or equal to x.
//
// Special cases are:
-// Ceil(+Inf) = +Inf
-// Ceil(-Inf) = -Inf
+// Ceil(±Inf) = ±Inf
// Ceil(NaN) = NaN
func Ceil(x float64) float64 { return -Floor(-x) }
// Trunc returns the integer value of x.
//
// Special cases are:
-// Trunc(+Inf) = +Inf
-// Trunc(-Inf) = -Inf
+// Trunc(±Inf) = ±Inf
// Trunc(NaN) = NaN
func Trunc(x float64) float64 {
// TODO(rsc): Remove manual inlining of IsNaN, IsInf
diff --git a/src/pkg/math/gamma.go b/src/pkg/math/gamma.go
index ae2c0c4..7365d8e 100644
--- a/src/pkg/math/gamma.go
+++ b/src/pkg/math/gamma.go
@@ -113,8 +113,7 @@
// Gamma(x) returns the Gamma function of x.
//
// Special cases are:
-// Gamma(Inf) = Inf
-// Gamma(-Inf) = -Inf
+// Gamma(±Inf) = ±Inf
// Gamma(NaN) = NaN
// Large values overflow to +Inf.
// Negative integer values equal ±Inf.
diff --git a/src/pkg/math/modf.go b/src/pkg/math/modf.go
index 315174b..34889e0 100644
--- a/src/pkg/math/modf.go
+++ b/src/pkg/math/modf.go
@@ -8,8 +8,7 @@
// that sum to f. Both values have the same sign as f.
//
// Special cases are:
-// Modf(+Inf) = +Inf, NaN
-// Modf(-Inf) = -Inf, NaN
+// Modf(±Inf) = ±Inf, NaN
// Modf(NaN) = NaN, NaN
func Modf(f float64) (int float64, frac float64) {
if f < 1 {
diff --git a/src/pkg/math/sincos.go b/src/pkg/math/sincos.go
index 4c1576b..e8261bc 100644
--- a/src/pkg/math/sincos.go
+++ b/src/pkg/math/sincos.go
@@ -7,7 +7,6 @@
// Sincos(x) returns Sin(x), Cos(x).
//
// Special conditions are:
-// Sincos(+Inf) = NaN, NaN
-// Sincos(-Inf) = NaN, NaN
+// Sincos(±Inf) = NaN, NaN
// Sincos(NaN) = NaN, NaN
func Sincos(x float64) (sin, cos float64) { return Sin(x), Cos(x) }
