function [f_0, g_0]=izokliny(u,v,fun_f_,fun_g_)

f_0=zeros(size(u));
g_0=zeros(size(u));
opts=optimset('fzero');
for i=1:length(u)
   f_0(i)=fzero(fun_f_ ,1,opts , u(i));
   g_0(i)=fzero(fun_g_ ,1,opts , u(i));
end
