title: Symbolic Math in MATLAB, solving simple integration
body: <p>I have a problem with solving a simple integration through MATLAB. I want to solve this symbolic and don't have any problems doing this through other programs.</p>
  
  <p>Well I have this equation:</p>
  
  <p>syms k x</p>
  
  <p>fX(x) = k * e^(-3*x) for 2 &lt;= x &lt;= 6</p>
  
  <p>which I want to integrate from the interval 2 to 6. Then I would solve the equation, so that fX(x) = 1, and solve the equation for k. I type:</p>
  
  <p>S = solve('int(k*exp(-3*x),x,2,6) = 1',k);</p>
  
  <p>And I get following error:
  Error, (in int) wrong number (or type) of arguments: invalid options or option values passed to indefinite
  integration. Unknown options: {2, 6}</p>
  
  <p>Why can't the int-function not take my limits?</p>