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<h2><b>acos</b></h2><p>
<code>acos(<i>expr</i>)</code><p>
Applies the cos<sup>-1</sup> function to the result of
<code><i>expr</i></code>. Values from <code><i>expr</i></code> that exceed
1 or are less than -1 are set to missing. The result of
the <code>acos</code> function is in radians.
<H3>Usage Notes</H3><P>
<H3>Examples</H3><P>
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