Description

Arccosine function. The arccosine is the angle whose cosine is number.

Returns

The arccosine, in radians, of a number.

Category

Function syntax

ACos(number)

See also

CosSinASinTanAtnPi

Parameters

Parameter

Description

number

Cosine of an angle. The value must be between -1.0 and 1.0, inclusive.

Usage

The range of the result is 0 to p.To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.

Example

<h3>ACos Example</h3> 
<!--- Output the arccosine value. ---> 
<cfif IsDefined("FORM.CosNum")> 
<cfif IsNumeric(FORM.CosNum)> 
<cfif Abs(FORM.CosNum) LESS THAN OR EQUAL TO 1> 
<cfoutput>ACos(#FORM.CosNum#) = #ACos(FORM.cosNum)# Radians </cfoutput> 
<br>or<br> 
<cfoutput>ACos(#FORM.CosNum#) = #ACos(FORM.cosNum) * 180/PI()#</cfoutput> 
<cfelse> 
<!--- If it is empty, output an error message. ---> 
<h4>Enter a number between -1 and 1</h4> 
</cfif> 
</cfif> 
</cfif> 

<form method="post" action = "acos.cfm"> 
<p>Enter a number to get its arccosine in Radians and Degrees. 
<br><input type = "Text" name = "cosNum" size = "25"> 
<p><input type = "Submit" name = ""> <input type = "RESET"> 
</form>

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