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  3. let r be a commutative ring with unity. prove that

Let R be a commutative ring with unity. Prove that f(x) is R[x] is a unit...

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Advance Math

Let R be a commutative ring with unity. Prove that f(x) is R[x]is a unit in R[x] iff f(x)=a is of degree 0 and is a unit in R.

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