Question

tan (90-A/2)=√3 then value of cos theeta

Answer 1

$\tan(90 - a \div 2) = \sqrt{3} \\ \tan(90 - (a \div 2)) = \tan(60) \\ 90 - (a \div 2) = 60 \\ a \div 2 = 30 \\ a = 60$
$cosa = cos60 = (1 \div 2)$
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