12.b. 1. Prove the derivation IxP(x) =(x)[(P(x) v Q(x)) → R(x)].
ExP(x), 3xQ(x)= xy(R(x) ^ R(y)). (8)
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fypdtdypfux*'778
9889887535577*455-4254-+4676856953535%56866355888300000582835656535686865656857282868242537572728383838282855737242599
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