Ex 8.3, 3 - If tan 2A = cot (A - 18), find value of A. - Ex 8.3

  1. Chapter 8 Class 10 Introduction to Trignometry
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Ex 8.3, 3 If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A. tan 2A = cot (A – 18°) cot (90 – 2A) = cot (A – 18°) Comparing angles 90 – 2A = A – 18 90 + 18 = A + 2 A 108 = 3 A 108/3= A 36 = A A = 36°

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