CREATE TABLE table_58886 ("Circuit" TEXT, "City / State" TEXT, "Date" TEXT, "Winner" TEXT, "Team" TEXT)

What is Circuit, when Team is 'R.J.MacArthur Onslow', and when City / State is 'Sydney , New South Wales'?
SELECT "Circuit" FROM table_58886 WHERE "Team" = 'r.j.macarthur onslow' AND "City / State" = 'sydney , new south wales'
SELECT "Circuit" FROM "table_58886" WHERE "City / State" = 'sydney , new south wales' AND "Team" = 'r.j.macarthur onslow'