Green's Theorem Examples

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Green's Theorem Examples.

Here we look at two examples using Green's Theorem.

The first says Evaluate ∫ y dx - x dy over the curve which is the positively oriented circle of radius 2 centered at the origin.

The second example is to evaluate ∫(x^2+y^2) dx + (x^2-y^2) dy over the positively oriented triangular region with vertices (0,0), (2,1) and (0,1).

To use Green's theorem there are really three major steps.

1. Identify P and Q from the line integral to calculate the appropriate partial derivatives.

2. Find the bounds for the region over which we want to evaluate the double integral.

3. Lay the smackdown on the double integral!

As always post any questions below!

Thanks for watching!

-dr. dub
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30 minutes to exam I finally understood this from you. great work.

clingyking
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Does Green's theorem imply that dQ/dx = dP/dy, because of Cauchy theorem on closed and analytic curves?

dalibormaksimovic
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Does using the line integral on the same question (1) give the same answer, I solved it via line integral and got -2pi . Can you guide me ( limit was 0-2pi)

silvershogun
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The second one is wrong. The integrand inside ∫[2x-1-(x^2-1/4x)]dx should be 2x-1-x^2 *+* 1/4x, you forgot to cancel the minus sign.

melontusk
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how do you find the limits of the integral

aaliyahkader
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Hi, May I please know which software do you use to write on?

meenarathi