Green's theorem- integral over an ellipse

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SUMMARY

This discussion focuses on applying Green's theorem to evaluate the line integral ∫C (y^2dx + xdy) over the ellipse defined by the equation x^2/a^2 + y^2/b^2 = 1. The key equation utilized is Green's theorem: ∫C Mdx + Ndy = ∫∫R (∂N/∂x - ∂M/∂y)dA. The user attempted to parametrize the ellipse using r(t) = (acost, bsint) but faced challenges in calculating the double integral ∫∫R (1 - 2y)dA. A suggestion was made to first calculate the area of a circle to build foundational understanding.

PREREQUISITES
  • Understanding of Green's theorem and its applications
  • Ability to parametrize curves in polar coordinates
  • Knowledge of double integrals and area calculations
  • Familiarity with the properties of ellipses
NEXT STEPS
  • Study the derivation and applications of Green's theorem
  • Learn how to parametrize ellipses effectively
  • Practice calculating double integrals over various regions
  • Explore the relationship between area and integrals in polar coordinates
USEFUL FOR

Students studying multivariable calculus, mathematicians interested in vector calculus, and anyone looking to deepen their understanding of line integrals and Green's theorem.

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Homework Statement


Use Green's theorem to find the integral ∫C (y^2dx+xdy) when C is the following curve (taken counterclockwise): the ellipse x^2/a^2 + y^2/b^2 =1.

Homework Equations


Green's theorem: ∫C Mdx+Ndy = ∫∫R (∂N/∂x-∂M/∂y)dA

The Attempt at a Solution


I tried parametrizing the ellipse as r(t)=(acost,bsint), but didn't know how to go on...

I don't know how to solve the double integral over the ellipse ∫∫R (1-2y)dA.

Thanks.
 
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Begin with simpler things to get an idea: how to calculate the area of a circle of r=1?
\int_{-1}^1\int_{?}^{?} dx dy

Replace the ?, then it should be clear for the ellipse.
 

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