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Question Number 18834 by mondodotto@gmail.com last updated on 30/Jul/17
Answered by Tinkutara last updated on 30/Jul/17
tan2A=cot(90°−2A)=cot(A−18°)SinceAisacute,socotA=cotB⇔A=B90°−2A=A−18°A=36°
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