Question

I need help in this ixl

Answer 1

`t^(9)s^(8)`

Explanation:

`s^(0) = 1; u^(-1) = (1)/(u) \\1(t)((1)/(u))(s^(8))(t^(8))(u)\\((t^(1+8))(s^(8))(u))/(u)\\t^(9)s^(8)`