1. Feb 28, 2010 #1

   James889

   

   Hi,
   
   I need to integrate the following:
   
   [tex]\int \frac{x^2}{\sqrt{9-x^2}}[/tex]
   
   So let [tex]x = 3sin\theta[/tex]
   [tex]\frac{dx}{d\theta} = 3cos\theta[/tex]
   
   So i now have the integral of [tex]\frac{9sin^2\theta \cdot 3cos\theta}{3cos\theta}[/tex]
   
   How do i go about the integration from here? parts?

    

   James889, Feb 28, 2010
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3. Feb 28, 2010 #2

   vela

   

   Staff Emeritus

   Science Advisor

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   Try simplifying the integrand first.

    

   vela, Feb 28, 2010

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