Jackie McNamara focused on the potential at Dundee United after dumping Rangers out of the Scottish Cup in his first match in charge at Tannadice.
Johnny Russell fired United ahead after just 15 seconds of the fifth-round tie and Jon Daly made it 2-0 on 36 minutes.
Russell's 16th goal of the season 11 minutes from time killed Rangers off and their miserable afternoon was completed by the late dismissals of Kal Naismith and Ian Black.
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