\(\frac{{3{\rm{tan}}{{20}^0} - {\rm{ta}}{{\rm{n}}^3}{{20}^0}}}{{1 - 3{\rm{ta}}{{\rm{n}}^3}{{20}^0}}}\) ?

\(\frac{{3{\rm{tan}}{{20}^0} - {\rm{ta}}{{\rm{n}}^3}{{20}^0}}}{{1 - 3{\rm{ta}}{{\rm{n}}^3}{{20}^0}}}\) ?
1). \(\frac{1}{{\sqrt 3 }}\)
2). 1
3). \(\sqrt 3 \)
4). \(\infty \)

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