show that:(x² + y2) (x2 - y2) - (x2 - y2)2 = 2(x?y2 - y4)
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(X^4 - y^4) -(x^4+y^4-2x^2y^2)
x^4-y^4-x^4-y^4+2x^2y^2
-2y^4+2x^2y^2
2(x^2y^2-y^4) ans.
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