y(x) = 25000 - x Cot[1000/25000] - (x^2 (3 25000 - 2 1000 Cot[1000/25000] - 1000 Tan[Pi/2 (1 - 1000/10000)]))/1000^2 - (x^3 (-2 25000 + 1000 Cot[1000/25000] + 1000 Tan[Pi/2 (1 - 1000/10000)]))/1000^3

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