Determine simpler formulas equivalent to these formulas. Show steps and the Law used in each step.
Note: the question marks s/b the sign for a conjunction: "and".
(a) ¬( ¬ P v Q) v (P ? ¬ R).
(b) ¬( ¬ P ? Q) v (P ? ¬ R).
(c) (P ? R) v [¬ R ? (P v Q)].