Prove or disprove the following: Note that to disprove a tautology, only one line of a truth

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Prove or disprove the following:

(a) (B  A)  (A  B) (b) (A / B)  (A  B) (c) (A / B)  (A V B)

Note that to disprove a tautology, only one line of a truth table is required.

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