Question: Prove or disprove: ( a ) ? b a r ( A ( ? b a r ( B ) ) ) b a r

Prove or disprove:
(a)?bar(A(?bar(B)))bar(A)?b=ar(A)
(b)A-(BC)=(A-B)(A-C).
Prove or disprove: (a)?bar(A(?bar(B)))bar(A)?b=ar(A) (b)A-(BC)=(A-B)(A-C).

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