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Math Question #1
Can anyone tell me what this equation means?



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I once tool a grad school class where on the first day, the professor said, "Now, just integrate around the unit circle..." and I knew I was in trouble and dropped the class the next day!

Normally, I'm pretty good at math, and enjoy it a lot. I *think* this equation is calculating the circumference of a circle, ellipse, or irregular object in polar coordinates, but I was wondering if this was a common equation, and what it was used for.

Here is the song that inspired this post... it's by the comedy troupe "Hard 'N Phirm", and it reminded me of the Kate Bush song:


i know and love the song - i'm a fan of Keith Schofield, who directed the video.

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