title: Python symbolic integration
body: <p>I am using symbolic integration to integrate a combined function of circular function and power function. </p>
  
  <pre><code>from sympy import *
  import math 
  import numpy as np
  t = Symbol('t')
  integrate(0.000671813*(7/2*(1.22222222+sin(2*math.pi*t-math.pi/2))-6)**0.33516,t)
  </code></pre>
  
  <p>However, when I finished input, it gives me an odd result: </p>
  
  <pre><code>0.000671813*Integral((3.0*sin(6.28318530717959*t - 1.5707963267949) - 2.33333334)**0.33516, t)
  </code></pre>
  
  <p>Why does this result contain <code>Integral()</code>? I checked online other functions and there is no <code>Integral()</code> in them.</p>