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You will need a pretty big HP router to do that cut in 1 3/4" door (exterior?). Drill four holes and cut away with a jig saw. Like someone said here, the trim will cover the ugly cuts from the jig saw. Don't over think it. If it has to be exact, then make a jig and use a long flush trim bit. Still, I trim as close to the cut line with a jig saw to prevent burning of the router bit.
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