railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
જો \(\rm \left(\frac{\cos A}{1-\sin A}\right)+\rm \left(\frac{\cos A}{1+\sin A}\right)=4\), તો A ની કિંમત શું હશે?(0° < A < 90°)
1
90°
2
45°
3
60°
4
30°