HTML Utilities
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<h3>Showing help on 'asin()'</h3>
Syntax:  asin (FLOAT &lt;x&gt;)   =&gt; FLOAT<br>
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Returns the arc-sine (inverse sine) of x, in the range [-pi/2..pi/2]. Raises E_INVARG if x is outside the range [-1.0..1.0].<br>

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