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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"
/*
* sinh(arg) returns the hyperbolic sine of its floating-
* point argument.
*
* The exponential func is called for arguments
* greater in magnitude than 0.5.
*
* A series is used for arguments smaller in magnitude than 0.5.
* The coefficients are #2029 from Hart & Cheney. (20.36D)
*
* cosh(arg) is computed from the exponential func for
* all arguments.
*/
const
(
p0 = -0.6307673640497716991184787251e+6;
p1 = -0.8991272022039509355398013511e+5;
p2 = -0.2894211355989563807284660366e+4;
p3 = -0.2630563213397497062819489e+2;
q0 = -0.6307673640497716991212077277e+6;
q1 = 0.1521517378790019070696485176e+5;
q2 = -0.173678953558233699533450911e+3;
)
export func Sinh(arg float64) float64 {
sign := false;
if arg < 0 {
arg = -arg;
sign = true;
}
var temp float64;
switch true {
case arg > 21:
temp = Exp(arg)/2;
case arg > 0.5:
temp = (Exp(arg) - Exp(-arg))/2;
default:
argsq := arg*arg;
temp = (((p3*argsq+p2)*argsq+p1)*argsq+p0)*arg;
temp = temp/(((argsq+q2)*argsq+q1)*argsq+q0);
}
if sign {
temp = -temp;
}
return temp;
}
export func Cosh(arg float64) float64 {
if arg < 0 {
arg = - arg;
}
if arg > 21 {
return Exp(arg)/2;
}
return (Exp(arg) + Exp(-arg))/2;
}
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