I need the solution of the exercise 5.1 this is from Dixit book microeconomics

ic Theory Maximum Value Functions 67 given utility level are the "(p, u). The situation is Exercises umer is compensated by o leave him on the same Exercise 5.1: The Cobb-Douglas Cost Function shown that Consider a production function (5.20) y = A [ I *, as, (5.22 j=1 t for the uncompensated where y is output, the r; are inputs, and A and the a; are positive constants. Let w = (w;) be the vector of input prices, and show utility function and the that the minimum cost of producing a given output level y is ncompensated and com- begin with a utility level C ( w, y) = B(y/A) '/B II ( w;/a; )as/8, (5.23 ) this I as the money in- oice. So long as all prices where B = _, a;. If B