Ifyế r, we define [x] to be the greatest integer n z such that n 〈 x. (thus, for example, 18.3] = 8, [π] = 3, [-π--4.) the function x-ixl is called the greatest integer function. determine the points of continuity of the following functions: (a) f(x) : = . (c) h(x) : =[ ]. g(x) : =x[4]. k(x) : =[1 (b) (d) (xメ0). sin x