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<h3>asin() function</h3>
Returns arcussinus of a value in radians.
<p><h4>Syntax</h4>
asin(<i>real</i>)</p>
<p><h4>Arguments</h4>
<i>real</i> -> sin of an angle.</p>
<p><h4>Example</h4>
asin(1.0) -> 1.5707963267949</p>