JAVA Math Functions

class file_name{
        public static void main(String ar[]){
               
               double a=7;
               System.out.println("acos : "+Math.acos(a));
              System.out.println("asin : "+Math.asin(a));
              System.out.println("atan : "+Math.atan(a));
              System.out.println("cbrt : "+Math.cbrt(a));
              System.out.println("cos : "+Math.cos(a));
              System.out.println("log : "+Math.log(a));
              System.out.println("sin : "+Math.sin(a));
        }
}

OutPut
----------------------------
acos : NaN
asin : NaN
atan : 1.428899
cbrt : 1.912931
cos : 0.7539022
log : 1.9459101
sin : 0.65698659