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Mathematics, 04.08.2019 20:30 wallsdeandre25521

156x6−624x4212x6−264x4+14x2−1=11+xc os4π9+11+xcos2π9+11−xcosπ9 i have no any idea. me

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156x6−624x4212x6−264x4+14x2−1=11+xc os4π9+11+xcos2π9+11−xcosπ9 i have no any idea. me...
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