plot Zeta(u+1) - (1/u + 0.577215668 + 0.0728159383 · u – 0.0048444781 · u^2 – 0.0003401389 · u^3 + 0.0001000277 · u^4 – 4.58184E-6 · u^5), u=-1,0.05

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