*ow*

[spycedtx]

My brain hurts:

X = Y

X2 = XY

X2-Y2 = (XY) - Y2

(X+Y)(X-Y) = Y(X-Y)

(X+Y)(X-Y) Y(X-Y)
----------- = ----------
(X-Y) (X-Y)

-> (X+Y) = Y

now, plug in X=1 and Y=1.