Java.lang.StrictMath.acos() Method

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Description

The java.lang.StrictMath.acos() method returns the arc cosine of a value, the returned angle is in the range 0.0 through pi. If the argument is NaN or its absolute value is greater than 1, then the result is NaN.

Declaration

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

public static double acos(double a)

Parameters

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

Return Value

This method returns the arc cosine of the argument.

Exception

NA

Example

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

package com.tutorialspoint;

import java.lang.*;

public class StrictMathDemo {

   public static void main(String[] args) {

      double d1 = 0.90 , d2 = 5.00;
   
      // returns the arc cosine of a value
      double dAbsValue = StrictMath.acos(d1); 
      System.out.println("arc cosine value of " + d1 + " = " + dAbsValue);

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

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

cosine value of 0.9 = 0.45102681179626236
cosine value of 5.0 = NaN