What is (2x-y)^2?
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The expression for the square of (2x - y) has to be determined.
(2x - y)^2
= (2x)^2 + y^2 - 2*2x*y
= 4x^2 + y^2 - 4xy
The required answer is (2x - y)^2 = 4x^2 + y^2 - 4xy
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