The simplified value of 1 - 2xy ÷ x3 - y3

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Expression =		1 -	2xy		÷		x³ - y³	- 3xy
			x² + y²				x - y

Expression =			x² + y² - 2xy		÷		(x - y)(x² + xy + y²)	- 3xy
			x² + y²				x - y

Expression =	(x - y)²	÷ (x² + xy + y² - 3xy)
	x² + y²

Expression =	(x - y)²	÷ (x² - 2xy + y²)
	x² + y²

Expression =	(x - y)²	÷ (x - y)²
	x² + y²

Expression =	1
	x² + y²

The simplified value of		1 -	2xy		÷		x³ - y³	- 3xy		is
			x² + y²				x - y