For tangent plane equation(adsbygoogle = window.adsbygoogle || []).push({});

z-z0 = [itex]f{x}[/itex](x0,y0)(x-x0) + [itex]f{y}[/itex](x0,y0)(y-y0)

how come there is no cross product of the partial derivatives [itex]f{x}[/itex] X [itex]f{y}[/itex] to give the normal vector for the plane?

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# Homework Help: Tangent plane to a surface, no need for cross product?

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