How ca I solve this problem in Matlab 2018b?

I'm trying to solve this question:

and arrive in

How can I do it? I tried this commands but didn't work. There is a way to solve this in matlab?

syms x y
solve(tan(atan(y/(x+1))-2*atan(y/x)==0))
solve(atan(y/(x+1))-2*atan(y/x)==0))

Answer 1

[Walter Roberson]

syms x y X
sol = solve(atan(y/(x+1))-2*atan(y/x)==pi, 'returnconditions', true)
eqn = (X == sol.x(2)).^2
lhs(eqn)-rhs(eqn)

However this is missing the multiplication by y that you are expecting.