If A > 0, B > 0 and A + B = ${\pi \over 6}$, then the minimum value of tanA + tanB is :

Question

If A > 0, B > 0 and A + B = ${\pi \over 6}$,

then the minimum value of tanA + tanB is :

$\sqrt 3 - \sqrt 2 $

$2 - \sqrt 3 $

$4 - 2\sqrt 3 $

${2 \over {\sqrt 3 }}$

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