The forward difference formulas make use of the values of the function to the right of the
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The forward difference formulas make use of the values of the function to the right of the base grid point. Thus the first derivative at point \(i\left(t=t_{i}\right)\) is defined as
\[\frac{d x}{d t}=\frac{x(t+\Delta t)-x(t)}{\Delta t}=\frac{x_{i+1}-x_{i}}{\Delta t}\]
Derive the forward difference formulas for \(\left(d^{2} x\right) /\left(d t^{2}\right),\left(d^{3} x\right) /\left(d t^{3}\right)\), and \(\left(d^{4} x\right) /\left(d t^{4}\right)\) at \(t_{i}\).
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