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## Homework Statement

Two points X(a,b) and Y(b,a)

Prove that the distance = sqrt2 (a-b)

## Homework Equations

d = sqrt(x2-x1)^2 + (y2-y1)^2)

## The Attempt at a Solution

I have drilled it down to

(sqrt 2b^2+2a^2-4ba) but unable to drill it down to sqrt2 (a-b)

Help appreciated - many thanks