Double Integration with Polar Coordinates

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SUMMARY

The discussion focuses on the double integration of the function f(x,y) = x + y over the region defined by 1 ≤ x² + y² ≤ 4, with constraints x ≥ 0 and y ≥ 0. The correct transformation to polar coordinates involves integrating ∬r(rcos(θ) + rsin(θ)) dr dθ, where r ranges from 1 to 2 (since r² goes from 1 to 4) and θ ranges from 0 to π/2. Participants clarify that the limits for r should be adjusted to reflect the square root of the bounds for r², ensuring accurate integration results.

PREREQUISITES
  • Understanding of double integrals in calculus
  • Familiarity with polar coordinate transformations
  • Knowledge of the function f(x,y) = x + y
  • Basic concepts of integration limits and regions in the Cartesian plane
NEXT STEPS
  • Study polar coordinate integration techniques in calculus
  • Learn about the properties of double integrals
  • Practice converting Cartesian coordinates to polar coordinates
  • Explore examples of integrating functions over circular regions
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Students and educators in calculus, mathematicians focusing on integration techniques, and anyone seeking to improve their understanding of polar coordinates in double integrals.

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1. Integrate f(x,y)=x+y
1<=x^2+y^2<=4, x>=0, y>=0


3. ∬x+y dxdy x=rcos(o) y=rsin(o)

∬r(rcos(o)+rsin(o))drdo
r is from 1 to 4, o is from 0 to pi/2


I get the wrong answer and don't know why
 
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[tex]x^2+y^2=r^2[/tex]

r doesn't go from 1 to 4. r^2 goes from 1 to 4.
the 0 to pi/2 seems good.

Don't know about the rest of the integral though sorry haven't learned polars yet :/
 

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