Question: Suppose that you had an algorithm to determine in polynomial time whether an expression is tautology. Use this algorithm to propose a polynomial-time algorithm whether

Suppose that you had an algorithm to determine in polynomial time whether an expression is tautology. Use this algorithm to propose a polynomial-time algorithm whether an expression is satisfiable. Given that satisfiability is NP-complete, what can you infer about the computational complexity of the tautology problem?

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