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The expression (2x - y)^2 has to be simplified.
Use the expansion (a + b)^2 = a^2 + 2*a*b + b^2
(2x - y)^2
= (2x)^2 - 2*(2x)*y + y^2
= 4x^2 - 4xy + y^2
The simplified form of (2x - y)^2 = 4x^2 - 4xy + y^2
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