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I suppose my question has to do with planes in general, rather than just tangent planes. Say you have a plane given by the equation

[tex]z=\frac{\partial f}{\partial x}(x)+\frac{\partial f}{\partial y}(y).[/tex]

How would you find the equation of the plane perpendicular to this one?

Thanks for your help.

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# Perpendicular Planes

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