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**1. Homework Statement**

Consider that f(x, y) = [sin^2(x − y)] / [|x| + |y|].

Using this, prove: lim(x,y)→(0,0) f(x, y) = 0

**2. Homework Equations**

Definition of a limit, etc.

**3. The Attempt at a Solution**

I don't know how to start... I've been trying to self-teach limits for a while and Don't know how to do it with the absolute values and two variables. Help is much needed.