[Maxima] Bug in integrate?

[Barton Willis]

Thanks--I'll make your change. 

Incidentally: I think the testsuite or the share test suite never calls subst10.  For fun, I tested a version of subst10
that sets ratexpand to all and  makes the substitution  var --> var(1/*d*) . That works too. Let's take the minimal patch.
 
--Barton

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Could someone else could change this (in sin.lisp)? thnx

RJF