dw Use the functions below to (a) express - as a function of t, both by using the Chain Rule and by expressing w in terms of t and differentiating directly with respect to t. Then (b) evaluate - at the given value of t. dw W=z- sin xy, x = 3t, y = In (t-4), z=el-5, t=5 dw (a) Express -as a function of t. dw at dw (b) Evaluate at att = 5. dw dt 1= 5 (Simplify your answer. Type an exact answer, using radicals as needed. Rationalize the denominator.) Enter your answer in each of the answer boxes