The java.lang.StrictMath.acos() is an inbuilt method which returns cosine of a given argument and an angle. The angle which is returned is within the range between 0.0 and pi.
Note: If the absolute value of the argument is greater than 1 or the argument is itself a NaN then the result is also NaN.
public static double acos(double num)
Parameters: The method accepts one parameter num which is of double type and refers the arc whose cosine is to be returned.
Return Value: The method returns the arc cosine of the argument.
Input: num = 0.45 Output: 1.1040309877476002 Input: num = 8.9 Output: NAN
Below programs illustrate the java.lang.StrictMath.acos() method:
Program 1: For positive number
The arc cosine value of 0.65 = 0.863211890069541 arc cosine value of 6.3 = NaN
Program 2: For negative number.
The arc cosine value of -0.65 = 2.278380763520252 arc cosine value of -6.3 = NaN
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