Calculating Area Inside Polar Curve: (-y/2)dx + (x/2)dy

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SUMMARY

The discussion focuses on calculating the area inside the limacon defined by the polar equation r = 5 - 3sin(θ) using the integral of the vector field (-y/2)dx + (x/2)dy. The divergence of the vector field is established as 1, allowing the transformation of the area integral into a simpler form. The solution involves converting polar coordinates to Cartesian coordinates with x = r cos(θ) and y = r sin(θ), followed by integrating from 0 to 2π.

PREREQUISITES
  • Understanding of polar coordinates and their conversion to Cartesian coordinates
  • Familiarity with vector fields and divergence
  • Knowledge of integral calculus, specifically line integrals
  • Experience with trigonometric functions and their properties
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  • Study the properties of limacon curves and their areas
  • Learn about line integrals in vector calculus
  • Explore the application of Green's Theorem in calculating areas
  • Investigate the process of converting between polar and Cartesian coordinates in detail
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Students studying calculus, particularly those focusing on vector calculus and polar coordinates, as well as educators looking for examples of area calculations in polar forms.

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Homework Statement



Using the integral of (-y/2)dx + (x/2)dy
Calculate the area inside the limacon with polar equation:

r = 5 - 3sin(theta)


Homework Equations





The Attempt at a Solution



No idea where to begin.
 
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notice that the divergence of the vector field that you are integrating over is 1. So, if you integrate 1 over the region of the limaçon, what can that integral be transformed into?
 
I think I've got it:

x = r cos(theta)
y = r sin(theta)

Solve for dx/d(theta) and dy(theta)

Integrate from 0 to 2(pi) and that should go well? :)
 

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