defence exam BSF Constable (Tradesmen) 2023 Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
What is the value of 3 sin2 30° + \(\frac{3}{5}\) cos2 60° − 2 sec2 45° ?
1
\(\frac{−5}{2}\)
2
\(\frac{−5}{8}\)
3
\(\frac{−31}{10}\)
4
\(\frac{−25}{17}\)