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{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT 256 26 "Calculating a differentia
l" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "f:=(2*x^2+x)*exp(4*x);
" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"fG*&,&*$)%\"xG\"\"#\"\"\"F*F)
\"\"\"F,-%$expG6#,$F)\"\"%F," }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 
0 26 "diff(diff(diff(f,x),x),x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,(
-%$expG6#,$%\"xG\"\"%\"#[*&,&F(F)\"\"\"F-F-F$F-F**&,&*$)F(\"\"#\"\"\"F
2F(F-F-F$F3\"#k" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "collect(
%,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,(*&-%$expG6#,$%\"xG\"\"%\"\"
\")F)\"\"#\"\"\"\"$G\"*&F%F.F)F+\"$c#F%\"#'*" }}}{EXCHG {PARA 0 "" 0 "
" {TEXT 257 47 "A 3rd order equation with constant coefficients" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 92 "eqn:=diff(diff(diff(x(t),t),
t),t)-7*diff(diff(x(t),t),t)+14*diff(x(t),t)-8*x(t)=40*sin(2*t);" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$eqnG/,*-%%diffG6$-%\"xG6#%\"tG-%\"$
G6$F-\"\"$\"\"\"-F(6$F*-F/6$F-\"\"#!\"(-F(6$F*F-\"#9F*!\"),$-%$sinG6#,
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\"#\"\"\"-%$cosGF+!\"\"*&%$_C1GF.-%$expGF&F.F.*&%$_C2GF.-F5F+F.F.*&%$_
C3GF.-F56#,$F'\"\"%F.F." }}}{EXCHG {PARA 0 "" 0 "" {TEXT 258 23 "An ho
mogeneous equation" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 42 "eqn2:
=3*t^2*diff(diff(x(t),t),t)-5*x(t)=0;" }}{PARA 11 "" 1 "" {XPPMATH 20 
"6#>%%eqn2G/,&*&)%\"tG\"\"#\"\"\"-%%diffG6$-%\"xG6#F)-%\"$G6$F)F*\"\"
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C1G\"\"\")F',&#F+\"\"#F+*$-%%sqrtG6#\"#p\"\"\"#F+\"\"'F+F+*&%$_C2GF+)F
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