The symmetric difference of AAA and BBB, denoted ADeltaBA \\Delta BADeltaB, is defined as:
(A−B)cup(B−A)(A - B) \\cup (B - A)(A−B)cup(B−A)
(AcupB)−(AcapB)(A \\cup B) - (A \\cap B)(AcupB)−(AcapB)
Neither a nor b
Both a and b