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         <td valign="top" class="name">ATN</td>
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    <td valign="top" colspan="2" class="description"><span class="title">Description</span>
<p>
Arctangent function. The arctangent is the angle whose tangent is number. 
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    <td valign="top" colspan="2" class="description"><span class="title">Returns</span>
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The arctangent, in radians, of a number. 
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    <td valign="top" colspan="2" class="description"><span class="title">Category</span>
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Mathematical functions
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    <td valign="top" colspan="2" class="description"><span class="title">Function syntax</span><pre>Atn(number)
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    <td valign="top" colspan="2" class="description"><span class="title">See also</span>
<p>
Atn, Sin, ASin, Cos, ACos, Pi
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    <td valign="top" colspan="2" class="description"><span class="title">Parameters</span>
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    <td valign="top" colspan="2" class="description"><span class="title">Usage</span>
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The range of the result is -<font face="Symbol">p</font>/2 to <font face="Symbol">p</font>/2 radians. To convert degrees to radians, multiply degrees by <font face="Symbol">p</font>/180. To convert radians to degrees, multiply radians by 180/<font face="Symbol">p</font>.
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    <td valign="top" colspan="2" class="description"><span class="title">Example</span><pre>&lt;h3&gt;Atn Example&lt;/h3&gt;
&lt;!--- output its Atn value ---&gt;
&lt;cfif IsDefined(&quot;FORM.AtnNum&quot;)&gt;
   &lt;cfif IsNumeric(FORM.AtnNum)&gt;
      Atn(&lt;cfoutput&gt;#FORM.AtnNum#&lt;/cfoutput&gt;) is  
     &lt;cfoutput&gt;#Atn(FORM.AtnNum)# radians is #Atn(FORM.AtnNum * 180/PI())# 
Degrees&lt;/cfoutput&gt;
   &lt;cfelse&gt;
&lt;!--- if it is empty, output an error message ---&gt;
      &lt;h4&gt;Enter a number&lt;/h4&gt;
   &lt;/cfif&gt;
&lt;/cfif&gt;
&lt;form action = &quot;evaltest.cfm&quot; method=&quot;post&quot;&gt;
&lt;p&gt;Enter a number to get its arctangent in Radians and Degrees
&lt;br&gt;&lt;input type = &quot;Text&quot; name = &quot;atnNum&quot; size = &quot;25&quot;&gt;
&lt;p&gt;&lt;input type = &quot;Submit&quot; name = &quot;&quot;&gt; &lt;input type = &quot;RESET&quot;&gt;
&lt;/form&gt;
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<td valign="top" class="name">NUMBER</td>
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<p>Tangent of an angle</p>

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