factorise x to the power 4 Y to the power 4 minus x into y
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x^4.y^4-xy
xy(x^3.y^3-1)
xy[{xy-1}{x^2.y^2+1+2(1)(xy)}]
xy(x^3.y^3-1)
xy[{xy-1}{x^2.y^2+1+2(1)(xy)}]
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