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## Homework Statement

Express the quantity ∂

^{2}/∂x

^{2}+∂

^{2}/∂y

^{2}in polar coordinates.

## Homework Equations

x=ρcosφ

y=ρsinφ

ρ=sqrt(x

^{2}+y

^{2})

## The Attempt at a Solution

This is my first post, so I apologize for any weird looking equations, etc. I know that this is not a difficult problem, but I just cannot figure out exactly how to set it up. I don't know what function to differentiate for x and y... Any guidance would be appreciated. Thank you!