def parabola_vertex(a, b, c):
   
  vertex=(((-b / (2 * a)),(((4 * a * c) - (b * b)) / (4 * a))))
  return vertex
def similar_elements(test_tup1, test_tup2):
  
  res = tuple(set(test_tup1) & set(test_tup2))
  return (res) 