Прошу помогите. Уже целый час не знаю как решить

Решите задачу:

$\Big ( \frac{n^{\frac{1}{4}}-m^{\frac{1}{4}}}{n^{-\frac{1}{2}}} \Big )^{-1}:\Big ( \frac{\sqrt{m}-\sqrt{n}}{n\cdot m^{\frac{1}{4}}-\sqrt[4]{n^5}} - \frac{n^{-\frac{1}{2}}}{n^{\frac{1}{4}}-m^{\frac{1}{4}}} \Big )=\\\\= \frac{n^{-\frac{1}{2}}}{n^{\frac{1}{4}}-m^{\frac{1}{4}}} :\Big (\frac{(m^{\frac{1}{4}}-n^{\frac{1}{4}})(m^{\frac{1}{4}}+n^{\frac{1}{4}})}{n\cdot (m^{\frac{1}{4}}-n^{\frac{1}{4}})} - \frac{1}{n^{\frac{1}{2}}\cdot (n^{\frac{1}{4}}-m^{\frac{1}{4}})} \Big )=$

$= \frac{1}{n^{\frac{1}{2}}(n^{\frac{1}{4}}-m^{\frac{1}{4}})} :\Big ( \frac{m^{\frac{1}{4}}+n^{\frac{1}{4}}}{n} - \frac{1}{n^{\frac{1}{2}}(n^{\frac{1}{4}}-m^{\frac{1}{4}})} \Big )=\\\\= \frac{1}{n^{\frac{1}{2}}(n^{\frac{1}{4}}-m^{\frac{1}{4}})} : \frac{(m^{\frac{1}{4}}+n^{\frac{1}{4}})(n^{\frac{1}{4}}-m^{\frac{1}{4}})-n^{\frac{1}{2}}}{n(n^{\frac{1}{4}}-m^{\frac {1}{4}})} =$

$= \frac{1}{n^{\frac{1}{2}}(n^{\frac{1}{4}}-m^{\frac{1}{4}})} \cdot \frac{n(n^{\frac{1}{4}}-m^{\frac{1}{4}})}{n^{\frac{1}{2}}-m^{\frac{1}{2}}-n^{\frac{1}{2}}}=$

$= \frac{n^{\frac{1}{2}}}{-m^{\frac{1}{2}}} =- \sqrt{\frac{n}{m}}$

$P.S.\; \; \sqrt{m}=m^{\frac{1}{2}}=(m^{\frac{1}{4}})^2$