Please answer question 22

18. u = e'g(e2 + ers, Int, In(etts + 1)). 901008 04 In Exercises 19 through 22, obtain a formula for the partial derivatives indicated. (Assume that the first variable of f is x and the second is y.) au du du 19. u = f(tr, ts); at ' ar' as au du du 20. u = f(tx, ty); at' ax' dy (Note: Here we are allowing x and y to stand not only for the variables of f, but we are also letting them appear in the formula.) au du 21. u = f(-x, -y) ; ax' dy you au du ithro bas doow tag asongd 22. u = f(y, x); ax' dy