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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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