If a > 0, b > 0, and
\(\frac{a \sqrt{b} + b \sqrt{a}}{a \sqrt{b} - b \sqrt{a}} - \frac{a \sqrt{b} - b \sqrt{a}}{a \sqrt{b} + b \sqrt{a}} = \sqrt{ab}\)
then write a equation epxressing a in terms of b.
