SSC SSC CHSL (Tier I & Tier II) Mock Test Series 2025 (New) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

यदि tan5A = Cot(4A – 18°) जहाँ 5A तथा (4A – 18°) न्यूनकोण हैं, तो A का मान क्या है?

1
15° 
2
12° 
3
16° 
4
18° 
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