railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

यदि cos 3A = sin(A - 18°) है, जहाँ 3A एक न्यूनकोण है, तो A का मान कितना है?

1
110°
2
108°
3
54°
4
27°
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