Psychological Egoism VS. Ethical Egoism,

what is ethical egoism rational egoism if psychological egoism is true, then why can’t it be our duty to be altruistic? arguments against psychological egoism
how is psychological egoism supposed to provide support for an argument for ethical egoism psychological altruism
give two different formulations of versions of psychological egoism and ethical egoism arguments against ethical egoism