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The FA Cup has seen some glorious free-kicks over the years – Nottingham Forest captain Stuart Pearce’s 1991 thronker against Spurs, Chelsea star Didier Drogba’s winning dipper in the 2010 final, and Everton legend Kevin Sheedy’s incredible twice-in-a-row effort against Ipswich in 1985, to name just a few. Many seem to defy logic, but can maths actually help explain how they were scored?