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    $\begingroup$ Since we can't see what your mysum is or what the items in it that cannot be matched it seems difficult to guess what the problem is. If you could show exactly what a dozen representative terms in mysum were, including some you don't want to delete and some you do, along with any and all Units involved, maybe even how to simply generate all of mysum then someone might be able to see what the error is. Or try /.{Sin[ _ ]->0,Cos[ _ ]->0} $\endgroup$ Commented Feb 11, 2015 at 0:30