Question: Question 1 ( 2 0 % ) Give a formal proof that the following wff is a tautology by using C P . Do not

Question 1(20%) Give a formal proof that the following wff is a tautology by using
CP. Do not use IP and do not use T.
AvvB(notBAvvC)
Question 2(20%) Give a formal proof that the following wff is a tautology by using
CP. Do not use IP and do not use T.
(AB??C)??(CvvDA)(CB)
Question 1(20%) Give a formal proof that the following wff is

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