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{SECT 0 {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 68 "u(x,y,z):=x*x*x+2*y*
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{XPPMATH 20 "6#>-%\"uG6%%\"xG%\"yG%\"zG,4*$)F'\"\"$\"\"\"F.*&\"\"#F.)F
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{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 28 "dx(x,y,z):=diff(u(x,y,z),x);
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\"#\"\"\"\"\"$*(\"\")F.F'F.F(F.F.*&\"\"'F.)F)F-F.F.*&\"\"(F.F(F.F." }}
}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 28 "dy(x,y,z):=diff(u(x,y,z),y)
;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>-%#dyG6%%\"xG%\"yG%\"zG,**$)F(\"
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{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 28 "dz(x,y,z):=diff(u(x,y,z),z);
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{PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "ddx(x,y,z):= diff(dx(x,y,z),x);" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#>-%$ddxG6%%\"xG%\"yG%\"zG,&F'\"\"'*&\"
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{MPLTEXT 1 0 30 "ddz(x,y,z):=diff(dz(x,y,z),z);" }}{PARA 11 "" 1 "" 
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\"\")\"\"(\"\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 30 "dxz(x,y
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\"\"*&\"#?F,)F(\"\"$F,F,*&\"#5F,)F'F0F,F,*&\"$I\"F,F'F,F,*&\"$T\"F,F(F
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