if tan 2A is equal to cot( A- 18 ) ,2a is an acute angle find angle A
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Answer: Given , tan 2A=cot(A-18°)
tan 2A=cot(90°-2A)
cot (A-18°)=cot(90°-2A)
A-18°=90°-2A
A+2A=90°+18°
3A=108°
A=108°/3
A=36°
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