Question: If u = f (w, x, y, z) = y2 - x2z + 4x, find the following. (a) u/w (b) u/x (c) u/y (d) u/z

If u = f (w, x, y, z) = y2 - x2z + 4x, find the following.
(a) ∂u/∂w
(b) ∂u/∂x
(c) ∂u/∂y
(d) ∂u/∂z

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