ASin

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

Mathematical functions

Function syntax

ASin(number)

See also

SinCosACosTanAtnPi

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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