mirror of
https://github.com/golang/go
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33 lines
575 B
Go
33 lines
575 B
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package math
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import math "sinh"
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export tanh
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/*
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tanh(arg) computes the hyperbolic tangent of its floating
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point argument.
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sinh and cosh are called except for large arguments, which
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would cause overflow improperly.
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*/
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func
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tanh(arg double) double
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{
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if arg < 0 {
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arg = -arg;
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if arg > 21 {
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return -1;
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}
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return -sinh(arg)/cosh(arg);
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}
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if arg > 21 {
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return 1;
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}
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return sinh(arg)/cosh(arg);
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}
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