Let a vertical tower $\mathrm{AB}$ have its end $\mathrm{A}$ on the level ground. Let $\mathrm{C}$ be the mid-point $\tan \beta$ is equal to :-
$\frac{4}{9}$
$\frac{6}{7}$
$\frac{1}{4}$
$\frac{2}{9}$
Correct Option: , 4
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