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{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 21 "page 68 number 17 (c)" }}
{PARA 0 "" 0 "" {TEXT -1 27 "We want to prove R=L below." }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "f:=proc(x,a) (x-a)/(1-a*x) end;" }}
}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 7 "f(x,a);" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "6#*&,&%\"xG\"\"\"%\"aG!\"\"F&,&F&F&*&F'F&F%F&F(F(" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "R:=f(x,(a+b)/(1+a*b));" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"RG*&,&%\"xG\"\"\"*&,&%\"aGF(%\"bGF
(F(,&F(F(*&F+F(F,F(F(!\"\"F/F(,&F(F(*(F*F(F-F/F'F(F/F/" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 15 "L:=f(f(x,a),b);" }}{PARA 11 "" 1 "
" {XPPMATH 20 "6#>%\"LG*&,&*&,&%\"xG\"\"\"%\"aG!\"\"F*,&F*F**&F+F*F)F*
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{MPLTEXT 1 0 4 "R-L;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,&*&,&%\"xG\"
\"\"*&,&%\"aGF'%\"bGF'F',&F'F'*&F*F'F+F'F'!\"\"F.F',&F'F'*(F)F'F,F.F&F
'F.F.F'*&,&*&,&F&F'F*F.F',&F'F'*&F*F'F&F'F.F.F'F+F.F',&F'F'*(F+F'F4F'F
5F.F.F.F." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "simplify(R-L);
" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"!" }}}{EXCHG {PARA 0 "> " 0 "
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