Word Count : 215

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We are given the function: \[ f(t) = t^3 \] and we need to evaluate the expression: \[ \frac{(f_{n+1}-2f_n+f_{n-1})}{h^2} \] where \( f_n = f(t_n) \), \( f_{n+1} = f(t_n + h) \), and \( f_{n-1} = f(t_n - h) \). ### Step ______ ___ _________ ________ __________ ____ ___ __________ _____ ____.
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