Question

tgx/2 = -1/2
tg^2 x/2 ????
Va roooooog ! E urgent

Answer 1

$tg\dfrac{x}2=-\dfrac{1}2\Rightarrow tg^2\dfrac{x}2=\left(-\dfrac{1}2\right)^2=\dfrac{1}4.$

Green eyes.