title: solve a system of nonlinear equations with c++
body: <p>I want to solve a system of equations in c++. Is there any tool/package that provides a solver? My system looks like </p>
  
  <pre><code>(x-a)^2 + (y-b)^2 = d1 
  (x-c)^2 + (y-d)^2 = d2
  </code></pre>
  
  <p>In that case I know a,..,d, d1,d2. </p>
  
  <p>For know i took a spacial case (a,b,d = 0, and c not 0) but I want a solution in all cases.</p>
  
  <p>Anybody an idea?</p>