Java Math.asin() method

The java.lang.Math.asin() is used to calculate the trigonometric Arc Sine of an angle. Arc Sine is also called as inverse of a Sine. This method returns the values between -Π / 2 and Π /2.

Syntax

Parameter

Return

If the argument is positive or negative number, this method will return the Arc Sine value.
If the argument is NaN or outside the range -1 and 1, this method will return NaN.
If the argument is zero, this method will return zero with the same sign as the argument.

Example 1

public class AsinExample1
{
    public static void main(String[] args) 
    {
        double a = 1.0;
        System.out.println(Math.asin(a));
    }
}

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Output:

1.5707963267948966

Example 2

public class AsinExample2
{
    public static void main(String[] args) 
    {
        double a = -1.0;
        System.out.println(Math.asin(a));
    }
}

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Output:

-1.5707963267948966

Example 3

public class AsinExample3
{
    public static void main(String[] args) 
    {
        double a = 1.820;
        // value of a is greater than 1 so Output is NaN
        System.out.println(Math.asin(a));
    }
}

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Output:

NaN

Example 4

public class AsinExample4
{
    public static void main(String[] args) 
    {
        double a = Math.PI;
        // return NaN because Math.PI value is 3.414 that is greater than 1
        System.out.println(Math.asin(a));
    }
}

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Output:

NaN

Example 5

public class AsinExample5
{
    public static void main(String[] args) 
    {
        double a = Math.PI;
        double b = Math.toRadians(a);
        System.out.println(Math.asin(b));
    }
}

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Output: