Only questions 13, 15

(x, y, Z) = (TT/ 4, 1/ 2, -1/ 2) Using a Branch Diagram In Exercises 13-24, draw a branch diagram and write a Chain Rule formula for each derivative. dz 13. dt for z = f(x, y), x = g(t), y = h(t) dz 14. dt for z = f(u, v, w), u = g(t), v = h(t), w = k(t) aw aw 15. and au au for w = h(x, y, z), x = f(u, v), y = 8(u, v), z = k(u, v) 16 aw aw and for w = fo " f ) = o(x v) s = h(r v)