A function f(x) is continuous at a point x = a if lim f(x) = x a Consider the function f(x)= { 9 cos(x) for x 0, 81|x| for x < 0. x-9x Is the function continuous at x = 0? We first evaluate the limit of f(x) at x = 0. The right-sided limit is: while the left-sided limit is: lim f(x) = x0+ lim f(x) = x-0 As a result, the limit is (enter DNE if the limit does not exist): lim f(x) = x0 The value of the function at x = 0 is: f(0) = and thus we conclude that f(x) i (No answer given) continuous discontinuous at x = 0.