Atn |
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Description
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Arctangent function. The arctangent is the angle whose tangent is number.
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Returns
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The arctangent, in radians, of a number.
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Category
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Mathematical functions
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Function syntax |
Atn(number)
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See also
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Atn, Sin, ASin, Cos, ACos, Pi
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Parameters
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Parameter |
Description |
number |
Tangent of an angle |
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Usage
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The range of the result is -p/2 to p/2 radians. To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.
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Example<h3>Atn Example</h3>
<!--- output its Atn value --->
<cfif IsDefined("FORM.AtnNum")>
<cfif IsNumeric(FORM.AtnNum)>
Atn(<cfoutput>#FORM.AtnNum#</cfoutput>) =
<cfoutput>#Atn(FORM.AtnNum)# radians =
#Evaluate(Atn(FORM.AtnNum * 180/PI())#
Degrees</cfoutput>
<cfelse>
<!--- if it is empty, output an error message --->
<h4>Enter a number</h4>
</cfif>
</cfif>
<form action = "atn.cfm">
<p>Enter a number to get its arctangent in Radians and Degrees
<br><input type = "Text" name = "atnNum" size = "25">
<p><input type = "Submit" name = ""> <input type = "RESET">
</form>
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