dz se the functions below to a express and as functions of u and v both by using the Chain Rule and by dv dz dz expressing z directly in terms of u and v before differentiating Then b evaluate and du dv z 4 tan dz x 11 Next find y 4y 2 2 y X dz du z dy 4x 2 2 x y Express z directly in terms of u and v x u cos v y usin v u v Type an exact answer v 6 1 7 Type an exact answer K at the given point u v