# Java Math asin() method with Example

Last Updated : 06 Apr, 2018

The java.lang.Math.asin() returns the arc sine of an angle in between -pi/2 and pi/2. Arc sine is also called as an inverse of a sine.

• If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
• If the argument is zero, then the result is a zero with the same sign as the argument.

Syntax :

```public static double asin(double angle)
Parameter :
angle : the value whose arc sine is to be returned.
```

Return :
This method returns the arc sine of the argument.

Example 1 : To show working of java.lang.Math.asin() method.

 `// Java program to demonstrate working` `// of java.lang.Math.asin() method` `import` `java.lang.Math;`   `class` `Gfg {`   `    ``// driver code` `    ``public` `static` `void` `main(String args[])` `    ``{` `        ``double` `a = Math.PI;`   `        ``// Output is NaN, because Math.PI gives 3.141 value` `        ``// greater than 1` `        ``System.out.println(Math.asin(a));`   `        ``// convert Math.PI to radians` `        ``double` `b = Math.toRadians(a);`   `        ``System.out.println(Math.asin(b));`   `        ``double` `c = ``1.0``;` `        ``System.out.println(Math.asin(c));`   `        ``double` `d = ``0.0``;` `        ``System.out.println(Math.asin(d));`   `        ``double` `e = -``1.0``;` `        ``System.out.println(Math.asin(e));`   `        ``double` `f = ``1.5``;`   `        ``// value of f does not lie in between -1 and 1` `        ``// so output is NaN` `        ``System.out.println(Math.asin(f));` `    ``}` `}`

Output:

```NaN
0.054858647341251204
1.5707963267948966
0.0
-1.5707963267948966
NaN
```

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