Posted by Anna on Sunday, April 1, 2012 at 11:08pm.
(x^-4 + y^-4) / (x^-3 + y^-3)
(y^4 + x^4)/(x^4*y^4) / (y^3 + x^3)/(x^3*y^3)
(x^4 + y^4)/(x^4*y^4) * (x^3*y*3)/(x^3 + y^3)
(x^4 + y^4)/(xy(x^3+y^3))
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