30 БАЛЛОВ! Помогите упростить выражение, пожалуйста!

Решите задачу:

$\displaystyle (\frac{2}{x^{1/4}-y^{1/4}}+\frac{2}{x^{1/4}+y^{1/4}})*\frac{x^{-1/2}-y^{-1/2}}{6x^{-1/4}y^{-1/2}}=\\\\\frac{2(x^{1/4}+y^{1/4})+2(x^{1/4}-y^{1/4})}{x^{1/2}-y^{1/2}}*\frac{x^{-1/2}-y^{-1/2}}{6x^{-1/4}y^{-1/2}}=\\\\=\frac{4x^{1/4}*\frac{y^{1/2}-x^{1/2}}{x^{1/2}y^{1/2}} }{(x^{1/2}-y^{1/2})*6x^{-1/4}y^{-1/2}}=-\frac{4x^{1/4}*\frac{y^{1/2}-x^{1/2}}{x^{1/2}y^{1/2}}}{(y^{1/2}-x^{1/2})*6x^{-1/4}y^{-1/2}}=$
$\displaystyle -\frac{2}{3}*x^{1/4}x^{1/4}y^{1/2}x^{-1/2}y^{-1/2}=-\frac{2}{3}*x^{1/2-1/2}y^{1/2-1/2}=-\frac{2}{3}$