Question Number 148723 by Rustambek last updated on 30/Jul/21
$${tgx}+{tgy}=\mathrm{4}\:\:\:{cosx}+{cosy}=\frac{\mathrm{1}}{\mathrm{5}}\:\:\: \\ $$$${tg}\left({x}+{y}\right)=? \\ $$
Commented by Rustambek last updated on 30/Jul/21
$${please} \\ $$