atives we (2) eorem, deriva- ing the Exercises 13.4 Chain Rule: One Independent Variable In Exercises 1-6, (a) express dw/dt as a function of t, both by using He Chain Rule and by expressing w in terms of r and differentiating directly with respect to r. Then (b) evaluate dw/dt at the given value oft 55114, y -SITE; 16. 17. 18. 9 A COSIT SIIII, y 2555 ONE " 19. y O, then A-COSI, y = sin' 1, - 3 y near 4w=In (a2+ y²+ 2²), x = cost, y = sin 1, z= 4√1; 20. 21. *-in (+1), y = tan 't, z=e; = 1 SHLAY, x=4 y = in 7, 22. Chain Rule: Two and Three Independent Variables Exercises 7 and 8, (a) express az/au and az/v as functions of u 23,5