-2/n+2/3n^3-2/5n^5+2/7n^7-2/9n^9+2/11n^11-2/13n^13+2/15n^15-2/17n^17+2/19n^19-2/21n^21+2/23n^23-2/25n^25+2/27n^27-2/29n^29

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