What is the value of $\frac{3}{2}\left(\frac{cos 39^{0}}{sin 51^{0}}\right)-\sqrt{sin^{2}39^{0}+sin^{2}51^{0}} $

What is the value of $\frac{3}{2}\left(\frac{cos 39^{0}}{sin 51^{0}}\right)-\sqrt{sin^{2}39^{0}+sin^{2}51^{0}} $
1). $\frac{1}{2}$
2). $\frac{5}{2}$
3). 0
4). both $\frac{1}{2}$ and $\frac{5}{2}$

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