Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

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

1

1/2

2

5/2

3

0

4

either 1/2 or 5/2

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