dz z se the functions below to a express and as functions of u and v both by using the Chain Rule and by du v Expressing z directly in terms of u and v before differentiating Then b evaluate z 3 tan a Express z 1 dz 8 x ucos v y u sin v u v and dz dy as functions of x and y 2 4 on oxact answer Find dz dz du and dz v at the given point u v