differentiation by llhuii

$2=1{r=e;for(gsub(/\^/,FS);c=$2*/x/;)r=(/^\+/?r"+":r)c*$1(--c>sub(/../,$1=e)?"x^"c:c?"x":e)}$0=r

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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