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February 16th, 2009, 02:03 AM  #1 
Newbie Joined: Feb 2009 Posts: 3 Thanks: 0  need help with evaluating integral...
I have this problem that I've been struggling with. The problem is f is integrable on [0, pi/3] sin theta/ cos^2 theta dtheta. I can't figure out what to substitute for cos^2 theta

February 16th, 2009, 03:16 AM  #2 
Newbie Joined: Jan 2009 Posts: 4 Thanks: 0  Re: need help with evaluating integral...
Just in case a picture helps... If you can see how the triangular network might satisfy the chain rule for differentiation, then you may see that you want to integrate up the straight dashed line with respect to the dashed balloon expression to find the function, F. Don't integrate  balloontegrate! http://www.ballooncalculus.org/examples 
February 16th, 2009, 05:16 AM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,692 Thanks: 976 Math Focus: Elementary mathematics and beyond  Re: need help with evaluating integral...
u = cos(theta), du = sin(theta)d theta

February 16th, 2009, 06:43 PM  #4 
Newbie Joined: Feb 2009 Posts: 3 Thanks: 0  Re: need help with evaluating integral...
thx guys, i was able to figure it out


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