In Fig. $AD = 4cm, BD = 3cm$ and $CB = 12cm$, find the $\cot\theta.$
  • A$​​\frac{12}{5}$
  • B$​​\frac{5}{12}​​ $
  • C$​​\frac{13}{12}$
  • D$​​\frac{12}{13}$
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