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tan 2A = cot ( A - 18°)
=> cot ( 90 - 2A) = cot (A - 18°)
=> 90 - 2A = A - 18
=> 3A = 108
=> A = 36°
=> cot ( 90 - 2A) = cot (A - 18°)
=> 90 - 2A = A - 18
=> 3A = 108
=> A = 36°
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Tan 2a =tan 90-a+18
2a+a=108
3a=108
A=36
2a+a=108
3a=108
A=36
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