SAO PAULO, Oct 30 (Reuters) - Brazilian President-elect Luiz Inacio Lula da Silva on Sunday promised to unite a divided country in a speech after defeating incumbent Jair Bolsonaro in a runoff presidential vote.Lula also invited international cooperation to preserve the Amazon rainforest and said he will seek fair global trade rather than trade deals that "condemn our country to be an eternal exporter of raw materials."Our Standards: The Thomson Reuters Trust Principles."