Quantitative Aptitude Number System Rational or Irrational Numbers

\({\rm{Simplify}}\,\frac{{\sqrt 5 \, - \,\sqrt 3 }}{{\sqrt 5 \, + \,\sqrt 3 }}\, - \,\frac{{\sqrt 5 \, + \,\sqrt 3 }}{{\sqrt 5 \, - \,\sqrt 3 }}:\)

1
\(- 2\sqrt {15} \)
2
\( - \frac{{17}}{4}\)
3
-1
4
\(2\sqrt {15} \)

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