By definition of exponentiation, , which is 1.

What exactly is f(x)? Do you mean that the derivativeoff(x) is , or do you want to say that is a derivative of something else? My guess is that and itsantiderivative (plus a constant). This is so because according to the power rule.

In plain text, you can write x^(2/3) to mean . Note the parentheses; x^2/3 means .