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W(x,y,z) = xy + yz + zx, x = u - v, y = ...

W(x,y,z) = xy + yz + zx, x = u - v, y = uv, z = u + v, u, v `in`R. Find `(del w)/(del u) , (del w)/(del v)` and evaluate then at `((1)/(2), 1)`.

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