I cannot see the attached image, however, if you mean something like this: [itex] \exp (x) [/itex] that is just the exponential function, so [itex] \exp(x) = e^x [/itex]
It's just a more convenient way of representing the function when its arguments start to get complicated
The brackets are just that- a way of indicating a separate calculation, no different from parentheses.
double x = 3.2; double y = Math.exp(x); // refers to the e^x math function
double x =3.2; double y = 4.3; double z = Math.pow(x,y); // for x^y math function