Question

tg (a + b),

если tga=-4 tgb=0.5
Срочно нужно

Answer 1

$\displaystyle\bf\\tg\alpha =-4\\\\tg\beta =0,5\\\\\\tg(\alpha +\beta )=\frac{tg\alpha +tg\beta }{1-tg\alpha \cdot tg\beta } =\frac{-4+0,5}{1-(-4)\cdot 0,5}=\frac{-3,5}{1+2} =-\frac{3,5}{3}=-1\frac{1}{6}$