√3√5
2√37
-2
-1
Correct answer is D
(1√5+√3−1√5−√3)×1√3
1√5+√3−1√5−√3
(√5−√3)−(√5+√3)(√5+√3)(√5−√3)
= √5−√3−√5−√35−√15+√15−3
= −2√32
= −√3
\therefore (\frac{1}{\sqrt{5} + \sqrt{3}} - \frac{1}{\sqrt{5} - \sqrt{3}}) \times \frac{1}{\sqrt{3}} = - \sqrt{3} \times \frac{1}{\sqrt{3}}
= -1
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