factorise. 3x²-4 1-(x-y)²
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Step-by-step explanation:
3x²-4 1-(x-y)² = 3x^2-41 -( x^2+y^2-2xy)
3x²-4 1-(x-y)² = 3x^2-41-x^2-y^2+2xy
3x²-4 1-(x-y)² = 2x^2 -41 +2xy
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