By 90min Eddie Nketiah is hopeful Arsenal can learn from their difficulties towards the end of last season to springboard to big achievements in the closing months of the current campaign. Arsenal are in the mix for the Premier League title with Liverpool and Manchester City as the run-in intensifies, while they resume their Champions League campaign on Wednesday night with a last 16 clash in Porto. Mikel Arteta’s Gunners are among the leading contenders to win both competitions and Nketiah, speaking at the launch event for Under Armour’s new boot, the UA Shadow Elite 2 in Shoreditch, London, …