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(t - (k(0))^2 t^3/6)^2 + (k(0)t^2/2 + k'(0)t^3/6 - 1/k(0))^2
(t - (k(0))^2 t^3/6)^2 + (k(0)t^2/2 + k'(0)t^3/6 - 1/k(0))^2
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