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(x²+y²/x²-y²---x²-y²/x²+y²)÷(x+y)(x-y)/(x-y)(x+y) |
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Answer» (X + y)² = x² + 2XY + y² ... it's the seecond as the PERFECT SQUARE rule: (x+y)^2=(x +y)(x+y)=x^2+xy+xy+y^2=(x*x)+(x*y)+(y*x)+(y* y). |
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