railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি A + B = 75° এবং A - B = 15° হয়, তবে 2 (1 + cos 2B) (1 + tan A) এর মান নির্ণয় করুন

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