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## Homework Statement

What is the derivative of x^2 + y^2 = 2y, and find the tangent line to this equation at (1,1)

## Homework Equations

## The Attempt at a Solution

I get y' = x / (1-y). However, how do I find the tangent line to this? When I plug in the values it divides by zero! (1 / (1-1))

Is this a trick question?