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Halle la solución de

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$\\ddot{x} - \\var{K}x = t^{2}$, $x(0) = 0$, $\\dot{x}(0) = 0$.

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$(-1/2)*(\\var{k}^{-4})*(\\exp(\\var{k}t) + \\exp(-\\var{k}t)) - \\var{k}^{-2}*t^{2} + \\var{k}^{-4}$

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