If tan2a=cot(a-q80)where 2a is acute angle identyfy
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Tan2A=cot(A-80°)
Cot(90°-2A)=cot(A-80°)
90°-2A=A-80°
90°+80°=A+2A
170°=3A
170°/3=A
A=56.6°
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