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compute sum (-1)^n sin( (\pi /17) ((2n+1)^3((2n+1)^2+1)(2(2n+1)^2+1))/6), n=1 to 34
compute sum (-1)^n sin( (\pi /17) ((2n+1)^3((2n+1)^2+1)(2(2n+1)^2+1))/6), n=1 to 34
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