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

sin4A - cos4A = 1 है, तो A/2, डिग्री (0 < A ≤ 90°) में, क्या है?

1
60
2
30
3
40
4
45
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