The conjugate of `(sqrtx - sqrty)` is `(sqrtx + sqrty)`. We multiply top and bottom of the fraction by this conjugate to remove the surds in the denominator.

`frac{2sqrtx}{sqrtx - sqrty} `

`= frac{2sqrtx}{sqrtx - sqrty} times frac{sqrtx + sqrty}{sqrtx + sqrty}`

`=frac{2x+2sqrt(xy)}{x-y}`

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