yup, that's the point.
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送交者: eng 于 2008-12-12, 19:10:20:
回答: Did you really learn Real Analysis or not? 由 shortstop 于 2008-12-12, 12:59:48:
the LHS is expanded from a convergent series, so there's no problem. but removing the parenthesis makes it non-convergent, which is exactly why it is wrong.
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