(x2-2xy + Y2) - (x2 + 2XY + Y2) = what

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• 1. 2xy-x2-y2+9 Decomposition cause death form
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• 3. Given x2 + y2 = 2, find the value range of x2-2xy-y2
• 4. If y = √ 1-2x + √ 2x_ 1 + 1 / 2, find √ x2 + Y2 - √ x2 + Y2 + 2XY =?
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• 9. Factorization factor 1-x2 + 2xy-y2
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