My Math Forum need help with evaluating integral...

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 February 16th, 2009, 01:03 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, 02:16 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, 04:16 AM #3 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,814 Thanks: 1046 Math Focus: Elementary mathematics and beyond Re: need help with evaluating integral... u = cos(theta), du = -sin(theta)d theta
 February 16th, 2009, 05:43 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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