# Java.lang.StrictMath.asin() Method

## Description

The java.lang.StrictMath.asin() method returns the arc sine of a value.The returned angle is in the range -pi/2 through pi/2. It include these cases −

• 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.

## Declaration

Following is the declaration for java.lang.StrictMath.asin() method

```public static double asin(double a)
```

## Parameters

a − This is the value whose arc sine is to be returned.

## Return Value

This method returns the arc sine of the argument.

NA

## Example

The following example shows the usage of java.lang.StrictMath.asin() method.

```package com.tutorialspoint;

import java.lang.*;

public class StrictMathDemo {

public static void main(String[] args) {

double d1 = 0.90 , d2 = 5.00, d3 = 0;

// returns the arc sine of a value
double dAbsValue = StrictMath.asin(d1);
System.out.println("arc sine value of " + d1 + " = " + dAbsValue);

// returns NaN if argument is NaN or its absolute value is greater than 1
dAbsValue = StrictMath.asin(d2);
System.out.println("arc sine value of " + d2 + " = " + dAbsValue);

// returns zero if the argument is 0
dAbsValue = StrictMath.asin(d3);
System.out.println("arc sine value of " + d3 + " = " + dAbsValue);
}
}
```

Let us compile and run the above program, this will produce the following result −

```arc sine value of 0.9 = 1.1197695149986342
arc sine value of 5.0 = NaN
arc sine value of 0.0 = 0.0
```
java_lang_strictmath.htm