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Homework Statement
Hello, I'm writing a summary of all calculus I've learned during this term and now I'm on line integrals. I wrote this so far:
http://img17.imageshack.us/img17/9776/algebrac.jpg
But I have Sigma of x and y (a similar expression was in my lecture notes), but there is no dy anywhere, do I need to add dy to that expression? or just treat y as a constant? (if line density is given as a function of x and y)
Homework Equations
The Attempt at a Solution
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