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# Java Math asin() method with Example

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
```