The Math.asin( ) function in JavaScript is used to return the arcsine of a number in radians.
Math.asin(x)=arcsin(x)=unique y,where y belongs to [-pi/2;pi/2] such that sin(y)=x
The Math.asin() method returns a numeric value between -pi/2 and pi/2 radians.
asin() is a static method of Math, therefore, it is always used as Math.asin(), rather than as a method of a Math object created.
Syntax:
Math.asin(value)
Parameters Used:
Value:A number in radians who arcsine you want to find.
Return Value:
The Math.asin() function returns the arcsine of the given number in radians.
Examples:
Input : Math.asin(1) Output : 1.5707963267948966 Input : Math.asin(-1) Output : -1.5707963267948966 Input : Math.asin(2) Output : NaN Input : Math.asin(0.5) Output : 0.5235987755982989
- When 1 is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.asin(1));
</
script
>
Output:
Output : 1.5707963267948966
- When -1 is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.asin(-1));
</
script
>
Output:
Output : -1.5707963267948966
- When 2 is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.asin(2));
</
script
>
Output:
Output : NaN
- When 0.5 is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.asin(0.5));
</
script
>
Output:
Output : 0.5235987755982989
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