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Z = f(x;y) where the two independent variables are x and y , while z is the dependent variable The graph of something like z = f ( x;y ) is a surface in threedimensional spaceGeometrical definition The axes of the original frame are denoted as x, y, z and the axes of the rotated frame as X, Y, ZThe geometrical definition (sometimes referred to as static) begins by defining the line of nodes (N) as the intersection of the planes xy and XY (it can also be defined as the common perpendicular to the axes z and Z and then written as the vector product N = z Z)That is, if z = xiy, then z = x−iy Teleconvertisseur Nikon Z Tc 2 0x Filtre Photo Achat Prix Fnac X+z=a plane