If the symbol denotes the greatest integer function defined in this section, evaluate the following. (if an answer does not exist, enter dne. ) (a) find each limit. (i) lim x→−6 x (ii) lim x→−6 x (iii) lim x→−6. 2 x (b) if n is an integer, evaluate each limit. (i) lim x→n− x (ii) lim x→n x (c) for what values of a does lim x→a x exist? the limit exists only for a