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Math Pages: Net Area and Green's Theorem
This site from Math Pages explains how to use Green's Theorem to find net area. It is very in-depth and mathematical, and would be very hard to understand without a prior knowledge of the subject.
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Math Pages: Polynomials From Pascal's Triangle
This site from Math Pages contains relevant information regarding polynomials from Pascal's Triangle. The information is in-depth and a good knowledge of the subject is advised for better understanding.