Question

se tg x=1/2 e tg y=1/4. Calcule tg(x+y)

Answer 1

tg(x+y) = tg x + tg y / 1-tg x.tg y

tg(x+y) =1/2 + 1/4 / 1 -1/2.1/4 

tg(x+y)=(2+1)/4 / 1-1/8
tg(x+y)=3/4 / 7/8
tg(x+y)=3/4 . 8/7
tg(x+y)=24/28
tg(x+y)=6/7