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| <h3 class="section">1.56 <code>tanh</code>, <code>tanhf</code>—hyperbolic tangent</h3> |
| |
| <p><a name="index-tanh-150"></a><a name="index-tanhf-151"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double tanh(double <var>x</var>); |
| float tanhf(float <var>x</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| |
| <p><code>tanh</code> computes the hyperbolic tangent of |
| the argument <var>x</var>. Angles are specified in radians. |
| |
| <p><code>tanh(</code><var>x</var><code>)</code> is defined as |
| <pre class="smallexample"> sinh(<var>x</var>)/cosh(<var>x</var>) |
| </pre> |
| <p><code>tanhf</code> is identical, save that it takes and returns <code>float</code> values. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The hyperbolic tangent of <var>x</var> is returned. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>tanh</code> is ANSI C. <code>tanhf</code> is an extension. |
| |
| <p><br> |
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