Question: Let ( = ((x, y, ((x, y)) be the acute angle between the z-axis and a normal vector to the surface z = ((x, y)

Let ( = ((x, y, ((x, y)) be the acute angle between the z-axis and a normal vector to the surface z = ((x, y) at the point (x, y, ((x, y)) on the surface. Show that sec ( = ((x2 + (y2 + 1. (This gives another formula for surface area: A(G) =

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