Question Number 34645 by JOHNMASANJA last updated on 09/May/18
$${show}\:{that}\:\mathrm{2}{tan}^{−\mathrm{1}} \mathrm{2}\:+\:{tan}^{−\mathrm{1}} \mathrm{3}= \\ $$$$\Pi\:+{tan}^{−\mathrm{1}} \frac{\mathrm{1}}{\mathrm{3}} \\ $$
show-that-2tan-1-2-tan-1-3-tan-1-1-3-