In java, the arccosine or inverse of cosine can be calculated by using java.lang.Math.acos() method. This method from the Math library returns the inverse of cosine between 0 and pi. Furthermore, It takes the angle as an argument and returns arc cos.
Syntax
public static double acos(double number)Parameters
number: the value whose inverse cosine will be computed.
Return value
The arc cos of argument value as a number. If the value NaN or infinity is passed in the argument. It’ll return NaN because the absolute value of NaN is greater than 1.
Explanation
In this example, we’ll be elaborating on acos() function which takes a double type value as an argument and returns the inverse of that number.
class AlgoIdeas {
public static void main( String args[] ) {
// passing positive infinity as an argument
double ans = Math.acos(Double.POSITIVE_INFINITY);
System.out.println("acos(∞) = " + ans);
// passing NaN value as an arguemnt
ans = Math.acos(Double.NaN);
System.out.println("acos(NaN) = " + ans);
// passing +1 as an arguemnt
ans = Math.acos(1);
System.out.println("acos(1) = " + ans);
// passing 0 as an arguemnt
ans = Math.acos(0);
System.out.println("acos(0) = " + ans);
// passing 3/2 value as an arguemnt
ans = Math.acos(3/2);
System.out.println("acos(3/2) = " + ans);
//passing -1 as an arguemnt
ans = Math.acos(-1);
System.out.println("acos(-1) = " + ans);
// passing NaN value as an arguemnt
ans = Math.acos(0.9);
System.out.println("acos(0.9) = " + ans);
}
}
Output
The above program will generate the following output when executed.
