(a) Express w/u and w/ as functions of u and y both by using the Chain Rule and by expressing w directly in terms of

(a) Express ∂w/∂u and ∂w/∂ν as functions of u and y both by using the Chain Rule and by expressing w directly in terms of u and ν before differentiating. Then 

(b) Evaluate ∂w/∂u and ∂w/∂y at the given point (u, ν).

w = ln (x + y + z), x = ue sin u, y = ue" cos u, Z z = ue": ue"; (u, v) = (-2, 0) =