Question Number 148961 by DomaPeti last updated on 01/Aug/21
$$\left({L}\centerdot\sqrt{{x}^{\mathrm{2}} +{y}^{\mathrm{2}} }+{n}_{\mathrm{0}} \right){sin}\left({atan}\left({df}\left({x}\right)/{dx}\right)\right)={c} \\ $$$${f}\left({x}\right)=? \\ $$