How do I determine whether statements are tautology? I know if they are all true, it's tautology, but how do I set the truth table?

For each of the following compound statements, determine whether or not the statement is a tautology. (a) ( P = Q) v (~ Q) [ Select ] (b) ((P = Q) AQ) = P [ Select ] ( c) ((P = Q) AP) = Q [ Select ] (d) (PAQ) = (PVQ) [ Select ] (e) ( P = Q ) 1 (~ Q) [ Select ] ( f ) ( P = Q ) A ((~ Q ) = P ) [ Select ]