#### Topic: dis. math question

Who knows about Truth Tables, Logic, and Proofs.

How to proof expressions shown below, using Equivalent Statements and not applying truth tables directly.

p ? ?(p ? s) ? (?s ? p)

?(p ? q) ? (p ? ?q) ? (q ? ?p)

-- Discrete Mathematics with Combinatorics

James A. Anderson, part 1.3, task 4

thanks in advance