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You can use parent(A) to see that a is not a polynomial, hence the error message. You need to tell sage that you want the image of a in the polynomial ring. You can also use Fx(a) for doing that.

You can use parent(A)parent(a) to see that a is not a polynomial, hence the error message. You need to tell sage that you want the image of a in the polynomial ring. You can also use Fx(a) for doing that.