title: Solving equations with maxima
body: <p>I can solve the equation bellow normally </p>
  
  <pre><code>sin(b1*(x-c1)) = sin(b2*(x-c2))
  b1*(x-c1)      =  b2*(x-c2)
  c2             = x-(b1*(x-c1))/b2
  
  for c1 = 0, b1 = 1, b2 = 1.5, x = pi/2
  
  c2 = (x-(b1*(x-c1))/b2) = 0.523598775598299
  </code></pre>
  
  <p>But when I try and do this in Maxima see below the answer is completely different what am I doing incorrectly? </p>
  
  <pre><code>kill(all)$
  numer:true$
  phase1:0; freq1:1; freq2:1.5; x:pi/2; solve(sin(freq1*(x-phase1))=sin(freq2*(x-phase2)),phase2);
  </code></pre>
  
  <p>Answer I get below
  <a href="https://i.stack.imgur.com/fPZnw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fPZnw.png" alt="Answer I get"></a></p>