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Factorise : x^4 + x^2y^2 + y^4 .

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Factorise : x4 + x2y2 + y4 .

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Best answer

x2 + x2y 2 + y4 = (x2 ) 2 + 2.x2 .y2 + (y2 ) 2 - x2y2  

= (x2 + y2 ) 2 - (xy)2 

 = (x2 + y2 + xy) (x2 + y2 - xy) 

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