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

যদি cos 3A = sin(A - 18°) হয়, যেখানে 3A একটি সূক্ষ্মকোণ, A এর মান কত হবে?

1
110°
2
108°
3
54°
4
27°
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