10 8- 6- y 4 2 5 10 15 20 X a) Calculate the left and right limits of these functions at the various points specified. Write diverges if the limit does not exist. lim f (x) = x-0 lim f(x) = lim f(x) = x-6 lim f(x) = Lo x -+ 6+ b) At which of the points a = 0; 4; 6; 7 does the limit of f exist