railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) 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