Question: Write the central finite difference formulas of the second order for (partial u / partial x) and (partial^{2} u / partial x^{2}) of function (u(x,

Write the central finite difference formulas of the second order for $\partial u / \partial x$ and $\partial^{2} u / \partial x^{2}$ of function $u(x, y, t)$ at the grid point $\left(x_{i+1}, y_{j}, t^{n+1}\right)$.

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