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## Homework Statement

Calculate the partial derivatives (∂f/∂x & ∂f/∂y)

## Homework Equations

## The Attempt at a Solution

really confusing me with the use of the summation and power to 3/2. This is my attempt, most definitely wrong but still tried.

∂f/∂x = x + c1*(2*(x-x1))*([( x-x1 )^2 + (y-y1)^2)]^(1/2)) + ... + cN*(2*(x-xN))*([( x - xN )^2 + (y-yN)^2)]^(1/2))

∂f/∂y = y + c1*(2*(y-y1))*([( x-x1 )^2 + (y-y1)^2)]^(1/2)) + ... + cN*(2*(y-yN))*([( x - xN )^2 + (y-yN)^2)]^(1/2))

sorry, I probably should know this, but I can't really think straight right now -_-

not sure if its just double chain rule or what...

thank you for any help