What chassis is used in 1989 with a cosworth engine?
CREATE TABLE "complete_international_formula_3000_resu" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT "chassis" FROM "complete_international_formula_3000_resu" WHERE "year"=1989 AND "engine"='cosworth';