Hi, I am new to maple, and I am just trying to get to grips with it but I need to know how to do the following (I have been looking through the help guide but everything I try seems to not work)

1). I need to find the coefficient of xyz² via a single function (Rather than just finding it once expanded or in a multistep process) to the equation (x+y+z)⁴

From what I have worked out its something like coeffs(expand((1)), x, y, z^2), but I am going wrong somewhere ...