derivative of sqrt(xy)

[-EquinoX-]

1. The problem statement, all variables and given/known data
What is the derivative of sqrt(xy) with respect to y?


2. Relevant equations



3. The attempt at a solution

The sqrt(xy) is equal as (xy)^(1/2), so therefore what I have is 1/2 (xy) ^ -1/2, why is this wrong?

[Tom Mattson]

You've forgotten to use the Chain Rule. You have to differentiate the function inside the radical.