Appcndix ,4 Solutions to the Excrcises 552 h) Calculatr the first five values of h l [ k ] and use therri for h2[k]: a a a =+ h z [ k ]= f f , c c -,0, ,0, 4 H'L(?) = a (1 z - I + 0.52-2 - 0.25,- * 0.252-5) > + - Solution 14.10 aj H ( z j = + D.5:-l - 0.52-' ~ - 22 z x X(2j = z-1 Solution 14.11 External part: /i/ > + 0.5 - 0.5 ' > 0.5