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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"
/*
* atan2 discovers what quadrant the angle
* is in and calls atan.
*/
const
(
pio2 = .15707963267948966192313216e1;
pi = .3141592653589793238462643383276e1;
)
export func Atan2(arg1, arg2 float64) float64 {
if arg1+arg2 == arg1 {
if arg1 >= 0 {
return pio2;
}
return -pio2;
}
x := Atan(arg1/arg2);
if arg2 < 0 {
if x <= 0 {
return x + pi;
}
return x - pi;
}
return x;
}
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