Slader to find the extreme values of a function f(x, y) on a curve xequalsx(t), yequalsy(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. as in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves.