Find by using Boolean algebra.
(A'+B').(A+B)=A'.B+A.B'
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(A'+B')(A+B) = A'(A+B) + B'(A+B)
= A * A' + A' * B + B' * A + B' * B (A * A' = 0, B * B' = 0)
= 0 + A' * B + B' * A + 0
= A' * B + A * B'
Hence Proved
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