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## Homework Statement

x^2 + y^2 < 1

Find the partial derivatives of the function.

## Homework Equations

x^2 + y^2 < 1

## The Attempt at a Solution

@f/@x = 2x = 0

@f/@y = 2y = 0

**4. Their solution**

@f/@x = 2x = 0

@f/@y = 2y + 1 = 0

5. My Problem

5. My Problem

I don't see how / why they get 2y + 1 for the partial of y?