177page

(a) +4 ra 514 trlEltr s h-h. !-trv /** fli , * i] -0 max ^jlt= gLtTl= ^1,-.J 9+/= 169 =gE *d max Zmax E0404 max Zmin Silll=E (sll0l^) (b) ++e-l E+H I E=el z=71=4 +=gelel E-d"JHJ =Ar-:dEHel EEI-= E=q =+ zli=I-g2l tr-* flE4lEAl -a* +rl-sal e.* rloJ€ € E_* 5zl€ EI ,l^1ts dlEl e+ Aol +el *rJ*"I ^l d"l 4C94. 6L u z+E tL6I olE4 z +q +zl.J uj-aj9E Eld.il el6ll *ZlE 6J d ol aeg+. +d +9 tL6IElC, g +a+E =I+El A q zld+ql 9;ll *Zitle-l + dol 4 as+ tIaL d+, =l+9 Eldoe ^I+rlH * +tlE + dol 44 gtrI. zl ^) OEI .t=zy EE6}q E 6ll=0l .ol ++E 4={, a^I5E 4B ql tr4 tr^.Jr+. +B €9ol Hjr +B *AE ,?€C ol 9i-e- q flzl 444szl t tri. zlBoJ9"l E;a 4 9 dtr+E 4stl uu[_e a, ullo]^84 dE+= 4,.lzlAl .J+ g.lq +d, -E t}.il r*ol r}*+r|. z}$sz} *o| ++ + sEg 6J izl elq. El- zl L]E x|-fttizl. Eq Cr+ z}*?zj'"] rtr g il C'Js-21 Eq dq =B+q-tr- +4'&6I tri. EallEol 9"lzlH, zlcg5.l q H 4 rt.E040q *d max ,1 ,.\ ?ggq -d max