MATLAB: I got a non-answer from solve()

Question

Here's some code. I know that one solution is eta = pi/6, A=20, and k=2*pi/lambda. I get a non-answer (A=A, eta=eta, k=k) from solve():

reset(symengine);clear all;
syms x lambda A k positive;
syms eta;
lambda = 1;
eq1 = A*sin(eta)-10;
eq2 = A*sin(k*lambda/6 + eta)-20;
eq3 = A*sin(k*5*lambda/12 + eta);
% try to solve
solve(eq1,eq2,eq3,A,eta,k)
ans = 
        A: [1x1 sym]
      eta: [1x1 sym]
        k: [1x1 sym]

Other things I've tried have yielded different results, but they were also non-productive. What am I missing here?

Thanks,

Susan

Answer 1

You get an answer!

b = solve(eq1,eq2,eq3,A,eta,k)
b.A  %A
b.eta  %eta
b.k    %k