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ASin
Last update:
May 18, 2026
Description
Determines the arcsine of a number. The arcsine is the angle whose sine is number.
Returns
The arcsine, in radians, of a number.
Category
Function syntax
ASin(number) |
See also
Parameters
Parameter | Description |
number | Sine of an angle. The value must be between -1 and 1, inclusive. |
Usage
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.
Example
<h3>ASin Example</h3>
<!--- Output its arcsine value. --->
<cfif IsDefined("FORM.SinNum")>
<cfif IsNumeric(FORM.SinNum)>
<cfif FORM.SinNum LESS THAN OR EQUAL TO 1>
<cfif FORM.SinNum GREATER THAN OR EQUAL TO -1>
ASin(<cfoutput>#FORM.SinNum#</cfoutput>) =
<cfoutput>#ASin(FORM.sinNum)# Radians</cfoutput>
<br> or <br>ASin(<cfoutput>#FORM.SinNum#</cfoutput>) =
<cfoutput>
#ASin(FORM.sinNum) * 180/Pi()# Degrees
</cfoutput>
<cfelse>
<!--- If it is less than negative one, output an error message. --->
<h4>Enter the sine of the angle to calculate, in degrees and radians.
The value must be between 1 and -1, inclusive.</h4>
</cfif>
<cfelse>
<!--- If it is greater than one, output an error message. --->
<h4>Enter the sine of the angle to calculate, in degrees and radians. The
value must be between 1 and -1, inclusive.</h4>
</cfif>
<cfelse>
<!--- If it is empty, output an error message. --->
<h4>Enter the sine of the angle to calculate, in degrees and radians. The
value must be between 1 and -1,inclusive.</h4>
</cfif>
</cfif>
<form action = "./evaltest.cfm" method="post">
<p>Enter a number to get its arcsine in Radians and Degrees.
<br><input type = "Text" name = "SinNum" size = "25">
<p><input type = "Submit" name = ""> <input type = "RESET">
</form>Example
<cfscript>
number=0.5;
writeOutput(asin(0.5)); // Returns 0.523598775598
</cfscript>
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