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// 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
import "math"
/*
* asin(arg) and acos(arg) return the arcsin, arccos,
* respectively of their arguments.
*
* Arctan is called after appropriate range reduction.
*/
func Asin(arg float64) float64 {
var temp, x float64;
var sign bool;
sign = false;
x = arg;
if x < 0 {
x = -x;
sign = true;
}
if arg > 1 {
return sys.NaN();
}
temp = Sqrt(1 - x*x);
if x > 0.7 {
temp = Pi/2 - Atan(temp/x);
} else {
temp = Atan(x/temp);
}
if sign {
temp = -temp;
}
return temp;
}
func Acos(arg float64) float64 {
if arg > 1 || arg < -1 {
return sys.NaN();
}
return Pi/2 - Asin(arg);
}
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