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

যদি cot A = [sin B/(1 - cos B)] হয়, তাহলে cot 2A এর মান কী?

1

cot(B/2)

2

cot 2B

3

cot B

4

tan B

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