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<h3>acos() function</h3>
Returns arcuscosinus of a value in radians.
<p><h4>Syntax</h4>
acos(<i>real</i>)</p>
<p><h4>Arguments</h4>
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<i>real</i> &rarr; cos of an angle.</p>
<p><h4>Example</h4>
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acos(0.5) &rarr; 1.0471975511966</p>