$2 \tan ^{-1} \frac{1}{5}+\tan ^{-1} \frac{1}{4}=$ কত ?

$\tan ^{-1} \frac{12}{13}$

$45^{\circ}$

$\tan ^{-1} \frac{32}{43}$

$60^{\circ}$

$\tan ^{-1} \frac{72}{45}$