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<h3>tan() function</h3>
Returns tangent of an angle.
<p><h4>Syntax</h4>
tan(<i>real</i>)</p>
<p><h4>Arguments</h4>
<i>real</i> -> angle in radians.</p>
<p><h4>Example</h4>
tan(1.0) -> 1.5574077246549</p>