Question

tg(arctg2-arctg1/2)
a)3/4 b)3/2 c)4/3 d)2/3

Answer 1

$tan(arctan2-arctanfrac{1}{2})=\=frac{tan(arctan2)-tan(arctanfrac{1}{2})}{1+tan(arctan2)tan(arctanfrac{1}{2})}=frac{2-0.5}{2}=1.5/2=0.75=3/4$

Вариант А