Five things we learned as Sanchez leads Arsenal to all three points at Crystal Palace

Arsenal claimed all three points at Selhurst Park on Thursday night, dominating the match for long periods and running out 3-2 winners thanks to two fine goals by Alexis Sanchez and a Shkodran Mustafi strike.The Gunners had one or two nervy moments and were put under pressure in the final minutes after James Tomkins headed a late goal from a corner, but they held on for an important victory.Has Sanchez refound his appetite?