I am trying to simplify this equation: ( ' = NOT)
The result I get is when using demorgan's and other rules is:
However, I know that this answer is only partially complete since I know from using a karnaugh map that the correct answer is
I know that the law of common identities states that
A'B + B = A+B
and this makes sense to me, but I'm not sure how I can apply that law here. If common identities is not the way to go, could someone show me how to solve this problem?