who is the entrant when the points is 42 (45) and the chassis is brabham bt20?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" text
);
SELECT "entrant" FROM "complete_formula_one_world_championship_" WHERE "points"='42 (45)' AND "chassis"='brabham bt20';