As you approach the seventh gate, you notice that it is only a short distance to the area where your computer indicated the communication device was stored. You look past the gate hopefully, as your computer translates: The passcode for this gate is found by determining the domain of the derivative of f (a) and then evaluating the derivative at c 28 Enter the domain in interval 46 notation. f (x) = V8 - 46x. Domain of f' (a ) : ab sin (a) ? f' ( - 28 46