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February 16th, 2009, 02:03 AM   #1
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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
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February 16th, 2009, 03:16 AM   #2
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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
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February 16th, 2009, 05:16 AM   #3
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Re: need help with evaluating integral...

u = cos(theta), du = -sin(theta)d theta
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February 16th, 2009, 06:43 PM   #4
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Re: need help with evaluating integral...

thx guys, i was able to figure it out
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