solve tan(x)+2*x=0

I am trying solve tan(x)+ 2*x=0. however when i checked the result I am not getting the result zero.Please help where I am wrong.

my code is

syms x
for n = 1:10
    x1 = (n-1/2)*pi;
    x2 = (n)*pi;
    v(n) = double(vpasolve(tan(x)+2*x == 0,x,[x1 x2]))
    check(n)=tan(180*v(n)/pi)+2*v(n)
end

v =

1.8366 4.8158 7.9171 11.0408 14.1724 17.3076 20.4448 23.5831 26.7222 29.8619

check =

74.6635 9.0421 18.6043 24.2170 40.6395 32.7051 40.4513 47.5085 55.4912 57.0835

Answer 1

[Sam Chak]

Hi @rakesh kumar

I think you are not wrong, but it has infinitely many solutions. The solution v is in radian, but you checked as if v is in degree.

[rakesh kumar]

thanks a lot,

Answer 2

[Torsten]

Your check must be

check(n)=tan(v(n))+2*v(n)

instead of

check(n)=tan(180*v(n)/pi)+2*v(n)

[rakesh kumar]

thanks, ihave made the correction. thanks once again