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

(cot\(\frac{α}{2}\) tanα - 1) (2 - tanα.sin2α) =? का मान ज्ञात कीजिये।

1
2secα
2
2sinα
3
2cosα
4
2tanα
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