clc; clear all; close all;
syms x k;
fc=0;
c=0;
y=x+cos(x);
yx=vectorize(y)
del=1e-9
vectorize(y);
a=-5
b=5
while 1
    fa=double(subs(y,'x',a))
    fb=double(subs(y,'x',b))
    c=(a+b)/2;
    fc=double(subs(y,'x',c))
    k=k+1
    if fa*fc>0
        a=c;
    else if fa*fc<0
        b=c;

        end
    end
    if(abs(fc)<=1e-9)
        break;
    end
end
fprintf('Nghiem x = %12.10f \n',c);