Question

хеелп !!!
пожалуста !!​

Answer 1

$tg\alpha=3\\\\tg(\alpha-\beta)=4\\\\\\tg(\alpha-\beta)=\frac{tg\alpha-tg\beta}{1+tg\alpha tg\beta} \\\\4=\frac{3-tg\beta}{1+3tg\beta}\\\\4+12tg\beta=3-tg\beta \\\\13tg\beta=-1\\\\\boxed{tg\beta=-\frac{1}{13}}$