compute sum (-1)^n sin( (\pi /8) n(n+1)(2n+1)(3n^4+6n^3-3n+1)/42), n=1 to 50compute sum (-1)^n sin( (\pi /8) n(n+1)(2n+1)(3n^4+6n^3-3n+1)/42), n=1 to 50

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