Use the resolution principle to derive contradictions from the negations of each of the following predicate calculus

Question:

Use the resolution principle to derive contradictions from the negations of each of the following predicate calculus tautologies:

(a) ∀x(P(x)→P(x))

(b) (⌉∃xP(x)→(∀x⌉P(x))

(c) (∀x⋁ (P(x),Q(x)))→(⋁((∀xP(x)),(∃xQ(x)))).

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