Question

tgB=?

tg(A+B)=-1

tgA=3

 

ПОМОГИТЕ ПЛИИИИЗ

Answer 1

$tg(alpha+beta)=frac{tgalpha+tgbeta}{1-tgalpha*tgbeta}$

$-1=frac{3+tgbeta}{1-3tgbeta}$

$-1+3tgbeta=3+tgbeta$

$tgbeta=2$