Consider the functions zequals8 e Superscript x Baseline ln y, xequalsln (u cosine v ), and yequalsu sine v. (a) Express StartFraction partial derivative z Over partial derivative u EndFraction and StartFraction partial derivative z Over partial derivative v EndFraction 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.(b) Evaluate StartFraction partial derivative z Over partial derivative u EndFraction and StartFraction partial derivative z Over partial derivative v EndFraction at (u, v)equals(5 comma StartFraction pi Over 6 EndFraction ).