CREATE TABLE table_78932 ("Home  ( 1st leg ) " TEXT, "Home  ( 2nd leg ) " TEXT, "1st Leg" TEXT, "2nd leg" TEXT, "Aggregate" TEXT)

What was the score of the 2nd leg when the Belgrano played the first leg at home with a score of 2-1?
SELECT "2nd leg" FROM table_78932 WHERE "1st Leg" = '2-1' AND "Home (1st leg)" = 'belgrano'
SELECT "2nd leg" FROM "table_78932" WHERE "1st Leg" = '2-1' AND "Home (1st leg)" = 'belgrano'