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<h2 class="chapter">17 Arithmetic</h2>
<p>Unless otherwise noted, all of the functions described in this chapter
will work for real and complex scalar, vector, or matrix arguments. Functions
described as <dfn>mapping functions</dfn> apply the given operation individually to
each element when given a matrix argument. For example,
<pre class="example"> sin ([1, 2; 3, 4])
0.84147 0.90930
0.14112 -0.75680
</pre>
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