Indeper Variables In Exercises 7 and 8, (a) express dz/ôðu and oz/ðv as functions of u and v both by using the Chain Rule and by expressing z directly in terms of u and v before differentiating. Then (b) evaluate az du and Chain Rule: Twó ahd dz/dv at the given point (u, v). 7. z = 4e* In y, x = In (u cos v), y = u sin v: (u, v) = (2, T/4) %3D

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