factorise (x²+ y²)²-4x²y²
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(x²+y²)²-4x²y²
x^4 + y^4 + 2x²y²-4x²y²
x^4 + y^4 -2x²y²
(x² - y²)²
x^4 + y^4 + 2x²y²-4x²y²
x^4 + y^4 -2x²y²
(x² - y²)²
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