Calculating Engaged User Percentage with Cohort Filters in Mixpanel

I have a metric A that is page views(unique users) I have some filters so we exclude a couple of pages using the Current URL and use these two cohorts. What I’m trying to do is get a percentage of engaged users by dividing A by the total of those two cohorts. If I add the metrics of unique users of those two cohorts and then a formula to do the division Mixpanel throws away my filter that excludes those pages we don’t want to count. There must be some way around this. Any ideas?