In what year did a car have a yamaha v12 engine and a brabham bt60y chassis
CREATE TABLE "complete_formula_one_results" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "pts" real
);
SELECT "year" FROM "complete_formula_one_results" WHERE "engine"='yamaha v12' AND "chassis"='brabham bt60y';