(2x_2y)^2 multiple the variable
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(2x - 2y)² = (2x)² + (2y)² - 2×2x×2y = 4x² + 4y² - 8xy
or 4(x²+y²-2xy)
or 4[(x-y)²]
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put the formula of( a+b) ^2
to get the answer
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