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Using a substitution method, where x = y = 0 and a = b = 1, we get
a) (0 AND 1) OR (0 AND 1)
b) (0 AND 1) AND (1 AND 1)
c) (0 OR 1) OR (1 AND 1)
simplifying (a) gives, 0 OR 0, which results in 0 = False
simplifying (b) gives, 0 AND 1, which results in 0 = False
simplifying (c) gives, 1 OR 1, which results in 1 = True
This is my first written solution. Apologies for the format/display. Share your solution, comments, and questions. Thank you kindly