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If tan 2A =cot (A-18^(@) ) where 2A is ...

If tan 2A `=cot (A-18^(@) ) ` where 2A is an acute angle , Find the value of A .

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The correct Answer is:
`A=36^(@) `
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tan A cot (A//2)-1=

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Find the value : 2/3 of 18