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polygens(QQ, 'x')
returns a tuple consistantly with polygens(QQ, 'x, y')
which also returns a tuple. If you want x
to get the unique element of that tuple, not the tuple itself, you can do:
sage: x, = polygens(QQ, 'x')
or (equivalently):
sage: (x,) = polygens(QQ, 'x')