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Dick

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HallsofIvy

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The linear approximation to f(x,y,z) at [itex](x_0,y_0,z_0)[/itex] is

[tex]f(x_0,y_0,z_0)+ \frac{\partial f}{\partial x}(x_0,y_0,z_0)(x-x_0)+ \frac{\partial f}{\partial y}(x_0,y_0,z_0)(y-y_0)+ \frac{\partial f}{\partial z}(x_0,y_0,z_0)(z-z_0)[/tex]

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