railway DFCCIL MTS 2025 Mock Test Series Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি 10 sec2x - 9 tan2x = 13 হয় এবং 0° ≤ x 90° হয়, তাহলে x এর মান কত হবে? 

1
30°
2
45°
3
60° 
4
90°
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