Question: please any two proof: 1. Prove the Claim: If ? ? and ? ?, then ? ? ? 2. Claim: If ? ? and ?

please any two proof:

1. Prove the Claim: If ? ? and ? ?, then ? ? ?

2. Claim: If ? ? and ? P (?) then ? P (?)

3. Claim: ? ? if and only if ?^? ?^c

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