By MATT MOORE Germany's Deutsche Bank AG said Thursday that improved trading, along with tax benefits in the U.S., lifted its net earnings to euro1.3 billion ($1.8 billion) in last year's fourth quarter.The bank, based in Frankfurt and Germany's biggest by assets, said the profit compared with a loss of euro4.8 billion in the final three months of 2008.It was buoyed by a euro554 million gain from tax benefits that arose from a decision to recognize deferred tax assets in the U.S.