Question 674023
{{{(x^3-x^2y+xy^2-y^3)/(x^4-y^4)}}}
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{{{((x^2+y^2)(x-y))/((x^2+y^2)(x^2-y^2))}}}
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{{{((x^2+y^2)(x-y))/((x^2+y^2)(x+y)(x-y))}}}
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{{{highlight_green(1/(x+y))}}}
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