i found it in the pdf manual , and the same in the online manual . in this page http://maxima.sourceforge.net/docs/manual/en/maxima_4.html#SEC10 , the 4th example of section " Operator: '' " :
(%i3) dispfun (foo_1a, foo_1b);
(%t3) foo_1a(x) := x log(x) - x
(%t4) foo_1b(x) := integrate(log(x), x)
(%o4) [%t3, %t4]
(%i4) integrate (log (x), x);
(%o4) x log(x) - x
(%i5) foo_2a (x) := ''%;
(%o5) foo_2a(x) := x log(x) - x
after the 1st (%o4) , there should be a (%i5) not a (%i4) . and there are some similar mistakes.
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