title: Is my equation too complex for matlab to integrate?
body: <p>I have a code that needs to evaluate the arc length equation below:</p>
  
  <pre><code>syms x
  
  a = 10; b = 10; c = 10; d = 10;
  
  fun = 4*a*x^3+3*b*x^2+2*c*x+d
  
  int((1+(fun)^2)^.5)
  </code></pre>
  
  <p>but all that returns is below:</p>
  
  <pre><code>ans = int(((40*x^3 + 30*x^2 + 20*x + 10)^2 + 1)^(1/2), x)
  </code></pre>
  
  <p>Why wont matlab evaluate this integral? I added a line under to check if it would evaulate int(x) and it returned the desired result.</p>