Question

are x=~(A(+)B) and x = (~A)(B)+(A)(~B) the same??

Answer 1

no

~(A+B) = (~A)(~B)
00 1
01 0
10 0
11 0
(~A)(B)+(A)(~B) = A+B
00 0
01 1
10 1
11 1