What was the Result F–A on 21 February 2009, when the league position was 1st?
CREATE TABLE "premier_league" (
  "date" text,
  "opponents" text,
  "h_a" text,
  "result_f_a" text,
  "attendance" real,
  "league_position" text
);
SELECT "result_f_a" FROM "premier_league" WHERE "league_position"='1st' AND "date"='21 february 2009';