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<title>The GNU Fortran Compiler: COSD</title>

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<a name="COSD-_002d_002d_002d-Cosine-function_002c-degrees"></a>
<h3 class="section">9.74 <code>COSD</code> &mdash; Cosine function, degrees</h3>
<a name="index-COSD"></a>
<a name="index-DCOSD"></a>
<a name="index-CCOSD"></a>
<a name="index-ZCOSD"></a>
<a name="index-CDCOSD"></a>
<a name="index-trigonometric-function_002c-cosine_002c-degrees"></a>
<a name="index-cosine_002c-degrees"></a>

<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p><code>COSD(X)</code> computes the cosine of <var>X</var> in degrees.
</p>
<p>This function is for compatibility only and should be avoided in favor of
standard constructs wherever possible.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>GNU Extension, enabled with <samp>-fdec-math</samp>.
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Elemental function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>RESULT = COSD(X)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code> or
<code>COMPLEX</code>.</td></tr>
</table>

</dd>
<dt><em>Return value</em>:</dt>
<dd><p>The return value is of the same type and kind as <var>X</var>. The real part
of the result is in degrees.  If <var>X</var> is of the type <code>REAL</code>,
the return value lies in the range <em>-1 \leq \cosd (x) \leq 1</em>.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">program test_cosd
  real :: x = 0.0
  x = cosd(x)
end program test_cosd
</pre></div>

</dd>
<dt><em>Specific names</em>:</dt>
<dd><table>
<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
<tr><td width="20%"><code>COSD(X)</code></td><td width="20%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">GNU Extension</td></tr>
<tr><td width="20%"><code>DCOSD(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">GNU Extension</td></tr>
<tr><td width="20%"><code>CCOSD(X)</code></td><td width="20%"><code>COMPLEX(4) X</code></td><td width="20%"><code>COMPLEX(4)</code></td><td width="25%">GNU Extension</td></tr>
<tr><td width="20%"><code>ZCOSD(X)</code></td><td width="20%"><code>COMPLEX(8) X</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr>
<tr><td width="20%"><code>CDCOSD(X)</code></td><td width="20%"><code>COMPLEX(8) X</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr>
</table>

</dd>
<dt><em>See also</em>:</dt>
<dd><p>Inverse function: <a href="ACOSD.html#ACOSD">ACOSD</a>
Radians function: <a href="COS.html#COS">COS</a>
</p>
</dd>
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