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expand 1/6((k+1/2)^6 - (k-1/2)^6) - 5/24((k+1/2)^4 - (k-1/2)^4) + 7/96((k+1/2)^2 - (k-1/2)^2)
expand 1/6((k+1/2)^6 - (k-1/2)^6) - 5/24((k+1/2)^4 - (k-1/2)^4) + 7/96((k+1/2)^2 - (k-1/2)^2)
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