,(wk@?\pbhyYowAw?\pbhyYs!WbhyY!BbhyYvww|Ȉl@ ?\pbhyY!BbhyY͚FVHYbhyYqG?@ !BbhyY!B;jp?\pbhyY!BbhyY ?\pbhyY?\p;jp ?\pV(i_@  ?\pV(i_@s!WV(i_@  !BU(i_@  !BU(i_@!BbhyY !BbhyY?\pbhyY ?\pbhyY?\pV(i_@ ?\pV(i_@!BU(i_@ @7@Z7@chiv͚FVHYbhyY!BbhyY ͚FVHYbhyY͚FVHY;jp̚FVHYd C ̚FVHYd C4e7Q@d C !Bd CZ7@!Bd C̚FVHYd C̚FVHYd C͚FVHYbhyY͚FVHYbhyY!BbhyY!BbhyY!Bd C7@Z7@!Bd C̚FVHYd C48:@d C 48:@d C48:@.x1j?\pd CZ7@ 48:@V(i_@! 48:@V(i_@?\pV(i_@"  ?\pV(i_@?\pd C# ?\pd C48:@d C$ 48:@d C48:@V(i_@ @7@Z7@& %!BU(i_@?\pV(i_@' %?\pV(i_@?\pbhyY(%?\pbhyY͚FVHYbhyY)%͚FVHYbhyY̚FVHYd C*%̚FVHYd C!Bd C+ %!Bd C!BU(i_@%@7@Z7@,?\p!V]ysc@Hv&p -,?\p!V]ysc@s!W!V]ysc@.-!B!V]ysc@ /,.?\p!V]ysc@!B!V]ysc@0aRqFULb!V]ysc@0/ q7@Z? MS Sans Serif1-48:@!V]ysc@ 2.1!B!V]ysc@48:@!V]ysc@0bHJd;>$!V]ysc@32 q7@Z5? kx? MS Sans Serif 4?\pd C̚FVHYd C6 548:@V(i_@?\pV(i_@7 5?\pV(i_@?\pbhyY85?\pbhyY͚FVHYbhyY95͚FVHYbhyY̚FVHYd C:5̚FVHYd C48:@d C;548:@d C48:@V(i_@5@7@Z7@<05EY@bhyYH(?Mv@į=<1.05EY@bhyYL.d@bhyY>=L.d@bhyY  ?<>05EY@bhyYL.d@bhyY @>L.d@bhyYL.d@;jpA<.,05EY@bhyY t@bhyYBA@L.d@N[2>M]@ CB<L.d@N[2>M]@05EY@bhyYDAyfp@ٿM@H-DT!?PEAN@>|^\^@HWґ?FEBD05EY@ghyYL.d@N[2>M]@ GB>L.d@N[2>M]@L.d@bhyY0ad0+`˘v}d^@So8N-@HC q7@Z ? MS Sans Serif0b=tS5i`@bhyYI? q7@Zǥ\ʥ\? MS Sans Serif0c$L.Xc@A4'JG q7@Z_n? MS Sans SerifK>BL.d@bhyYL.d@N[2>M]@LKMOw@bhyY  M@LMOw@bhyYMOw@;jp NBL.d@N[2>M]@ ^|&t@N[2>M]@OMNMOw@N[2>M]@QB>PL.d@N[2>M]@L.d@bhyYR>LPL.d@bhyYMOw@bhyYSLOPMOw@bhyYMOw@N[2>M]@TOBPMOw@N[2>M]@L.d@N[2>M]@P7@Z7@U ?\pV(i_@48:@V(i_@VUgS/!rV(i_@H2qdYW?\pd C̚FVHYd C XWVgS/!rV(i_@gS/!rd CYWXgS/!rd C ZVYgS/!rV(i_@gS/!rd C0a - b8gS/s+)F@[Z ejes #]? MS Sans Serif/Fig.4.1 MS Sans Serif \`d`bs /Fig. 4.2 MS Sans Serif ]Pp@bs /(a+b) ( a-b) = a^2 - b^2 MS Sans Serif ^i@^s /c^2 MS Sans Serif _0q@@^s `EBD05EY@ghyYL.d@N[2>M]@a=Co_]@٭`Ds b=Co_]@٭`Ds  c=v4ϩ7*c@&aIaHvR@d=L"dVR@0 ՅJFHjj+@ ed>c05EY@bhyYL.d@bhyYe cu