title: wxMaxima transform trigonometric expression
body: <p>I got a equation in the following form</p>
  <pre><code>f(t) = 2*cos(t) + 3*sin(t) 
  </code></pre>
  <p>and I want to reduce it to something like</p>
  <pre><code>f(t) = (9 + 4)^(1/2) * cos(t - atan(3/2))
  </code></pre>
  <p>None of the trigonometric simplify functions seems to work. Is there a way to do so?</p>