Question: The Neumann boundary condition (partial u / partial x=a) at (x=0) has to be implemented in a finite difference scheme. The grid is uniform with

The Neumann boundary condition $\partial u / \partial x=a$ at $x=0$ has to be implemented in a finite difference scheme. The grid is uniform with step $\Delta x$. Select a finite difference approximation of the boundary condition if the scheme's order of approximation in $x$ is:

a) First

b) Second.

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