<h3>sin() function</h3>
Returns sinus of an angle.


<p><h4>Syntax</h4>
     sin(<i>real</i>)</p>

<p><h4>Arguments</h4>
<i>real</i> &rarr; angle in radians.</p>

<p><h4>Example</h4>
     sin(1.571) &rarr; 0.999999682931835</p>
