Question: Let L 1 and L 2 be any two languages over * where = {a,b}. Prove or disprove: (a) If L 1 L 2 and

Let L1 and L2 be any two languages over * where = {a,b}. Prove or disprove:

(a) If L1 L2 and L2 is regular, then L2 L1 is regular.

(b) If L1 = L1L2 and / L2, then L1 =

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