In 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, and 40, construct an algebraic proof for the given

statement. Cite a property from Theorem 6.2.2 for every step.

For all sets A and B, (An B) nA=A-B

38. For all sets A and B, (An B) n A = A - B.