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expand 1/5 ((k+1/2)^5 - (k-1/2)^5) - 1/6 ((k+1/2)^3 - (k-1/2)^3)
expand 1/5 ((k+1/2)^5 - (k-1/2)^5) - 1/6 ((k+1/2)^3 - (k-1/2)^3)
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