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## Homework Statement

Determine whether the following sets form subspaces of R2:

{ (X1, X2) | |X1| = |X2| }

{ (X1, X2) | (X1)^2 = (X2)^2 }

## Homework Equations

## The Attempt at a Solution

I'm clueless. I've been trying to figure it out for a good thirty minutes on both of them, but I'm completely stuck.