Java - Math asin(double) Method

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Description

The Java Math asin(double a) returns the arc sine of an angle, in the range of -pi/2 through pi/2.Special 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.

A result must be within 1 ulp of the correctly rounded result. Results must be semi-monotonic.

Declaration

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

public static double asin(double a)

Parameters

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

Return Value

This method returns the arc sine of the argument.

Exception

NA

Getting Arc Sine of an Angle Example

The following example shows the usage of Math asin() method.

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a variable x which is equal to PI/2
      double x = Math.PI / 2;

      // convert x to radians
      x = Math.toRadians(x);

      // get the arc sine of x
      System.out.println("Math.asin(" + x + ")=" + Math.asin(x));
   }
}

Output

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

Math.asin(0.027415567780803774)=0.02741900326072046

Getting Arc Sine of a 0° Angle Example

The following example shows the usage of Math asin() method of 0° angle.

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a variable x which is equal to zero
      double x = 0.0d;

      // convert x to radians
      x = Math.toRadians(x);

      // get the arc sine of x
      System.out.println("Math.asin(" + x + ")=" + Math.asin(x));
   }
}

Output

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

Math.asin(0.0)=0.0

Getting Arc Cosine of a 45° Angle Example

The following example shows the usage of Math asin() method of 45° angle.

package com.tutorialspoint;

public class MathDemo {

   public static void main(String[] args) {

      // get a variable x which is equal to zero
      double x = 45.0d;

      // convert x to radians
      x = Math.toRadians(x);

      // get the arc sine of x
      System.out.println("Math.asin(" + x + ")=" + Math.asin(x));
   }
}

Output

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

Math.asin(0.7853981633974483)=0.9033391107665127