If sec (5α - 15°) = cosec (15° - 2α), then the value of cos 3α + sin 2α + cot α is:
1
\(\frac{{3\sqrt 3 }}{2}\)
2
\(\frac{{\sqrt 3 \left( {\sqrt 3 \, - \,1} \right)}}{2}\)
3
\(\frac{{\sqrt 3 }}{2}\)
4
\(\frac{{\sqrt 3 \left( {\sqrt 3 \, + \,1} \right)}}{2}\)