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(x-y)^2= (x-y)(x-y)..........

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(x-y)² is the factor of perfect square trinomial. 

To find its product (the perfect square trinomial):

 (x-y)² = x² - 2xy + y²  ⇒   ANSWER

Remember that the product of square of binomial is a perfect square trinomial.  Hence, the patter:

(x-y)² = x² -2xy + y²

(x+y)² = x² + 2xy + y²
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