8. For the function w = 2ye-In z. x=In(2+1). y tant, ze². a) Draw a branch diagram and write a Chain Rule formula for b) Use the formula to express as a function of t 9. For the function u = er sin¹p, p= sinx, q= z² Iny, r = 1/z, a) Express u in terms of x, y and z b) Find Ju Ju ax'ay and ฮิน az