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

यदि Cos2α - Sin2α = tan2β है, तो Cos2β - Sin2β =? ज्ञात कीजिए। 

1
tan2α 
2
Cot2α 
3
Cot2β 
4
tan2β 
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