railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি tan A = 10/15 হয়, তাহলে cos2 A -এর মান কত?

1
59/269
2
49/269
3
225/325
4
169/269
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