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15. 5r--d E =01 LJtrl. (zl) +€ tlzl f i]"lE *€ge alr. aa6l = q ga+. (.+) +€s= 948^l +l dq vJ E]."rI *ql +=tr}. 16. EJE "l +g += oJErl. (4 '*+ HlEtql^J g€z}4el +E+= x|_q.E p +ql -Eg z.l +lu}. s t *uzy EJ _ *E _ = . E- g zl tltrI. (.r) '*+el- +"J+= +=uJ"J =Jt+ Bl alql "*a1 =€ +:o+= ^I+6Iq iild4. (=ts 13 * =l (r]) "[ t]6]4l u]Ed du]. 17. VT (.l) (El) tl -d E =-d -Lrtrl. g€ +el-tr- 5-= *€. ^I+-d-lq E-€. zlajr+. €gzl zll= fl€ +dql *z ,IHal d, + 6I, +F- +--=A +l€g -E-q €-Aq. fl B"l 9F"1tr€ "J a +qi= € g4 ,ll 2tl = *ol- "Ii *,2 € *42)= ++. ts94zll9 CE€. +E^l z|"Jul gaq. +€g +zl6i$^l ?l€g gflu}. +€ol v}#q= ++.1= t}#g=_ +€*+= ^I+6}q 5zl +E^J i.q gA+. r=J 12 Af . 6l-d Er-g Eol ?l= Af^|. (c) E+t (d) *a - ' ,al 1? EFE tr_l ^ol= Eob JEI rv O+ ,E I lJ | +Cj Fr) ("1) (E]) 18. +EE H?-ell.rf. (4 +€"1 r}+g +gql €l= *€- ^I+6}q Eg z.lrttrI. (t-|) +€ +-F+-=- ^I+6Iq _IrE^F-=- Ezl^l +€ +++ql E6l r|+EJ +el ql +sR^J E?tq. (rl) 4++ ?)zl Z ,4 ql= LI+T] Eg ^l-+6}q B+trI. F-D u-az; +-e-qH +€ rI .il eq4 91ts- &+i fErIts Ezl] Eg "l+6lq Eqt+. ls. EE "J A=-Ll-tr|-. (4 C € ?€€- E€ol ul zJr= 6}z1 9*"1-E. zttalrl. -zz]u| jlTl€- +al zl*ol "J=lz1 B ulql = E€g +tr}. (4 s:--€HJHql= F_€zl E"J!= +4= *Bol 9lz s* iitsg "J=olu} =iel EI^l cllnls,+=q rJt€- ^I+6lq +Bql _racalE uJBol gltrI. (rr) _ s _ Zltss Eq ,I9zl7E ol$aNr'l +€+ zl=+r}. 20. +:d= :sr.g-Lltrl. -48-