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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"
/*
* tanh(arg) computes the hyperbolic tangent of its floating
* point argument.
*
* sinh and cosh are called except for large arguments, which
* would cause overflow improperly.
*/
export func Tanh(arg float64) float64 {
if arg < 0 {
arg = -arg;
if arg > 21 {
return -1;
}
return -Sinh(arg)/Cosh(arg);
}
if arg > 21 {
return 1;
}
return Sinh(arg)/Cosh(arg);
}
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