Double Integration - Finding the limits

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SUMMARY

The discussion focuses on finding the limits of a double integral for the function z = f(x,y) over the region bounded by the x-axis and the semi-circle defined by the equation x² + y² = 4, where y ≥ 0. Participants clarify that the task involves determining the numerical limits for the outer integral and the functional limits for the inner integral. It is emphasized that the integration should be performed first with respect to y and then x, requiring a graphical representation to identify the appropriate limits.

PREREQUISITES
  • Understanding of double integrals in calculus
  • Familiarity with Cartesian coordinates and graphing
  • Knowledge of the equation of a circle and its properties
  • Ability to interpret and set limits of integration
NEXT STEPS
  • Study the process of setting limits for double integrals in calculus
  • Learn how to graph equations of circles and identify regions for integration
  • Explore examples of double integrals with varying limits
  • Practice solving double integrals with functions of two variables
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Students in calculus, particularly those learning about double integrals, educators teaching integration techniques, and anyone needing to visualize and solve integrals over specific geometric regions.

NotStine
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Homework Statement



Find the limits of the integral of z = f(x,y) over the region bounded by the x-axis, and the semi-circle x2 + y2 = 4, y ≥ 0

Homework Equations





The Attempt at a Solution



Where do I start on this question? I can't understand what it is asking.

IbaIdc

Am I supposed to find a,b,c,d limits of the double integrals? If so, can you please point me in the right direction. I am completely lost.
 
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NotStine said:

Homework Statement



Find the limits of the integral of z = f(x,y) over the region bounded by the x-axis, and the semi-circle x2 + y2 = 4, y ≥ 0

Homework Equations





The Attempt at a Solution



Where do I start on this question? I can't understand what it is asking.
It seems simple enought to me. x2+ y2= 4 gives a circle with center at (0, 0) and radius 4. You are asked to integrate over the top half of that: y> 0.

IbaIdc

Am I supposed to find a,b,c,d limits of the double integrals? If so, can you please point me in the right direction. I am completely lost.
Since the problem specifically said "find the limitsof integration", yes, that is what you are supposed to do! I recommend that you start by drawing the graph.

Remember that, since the final result is a number, the limits of integration on outer integral must be numbers. It will be simplest to integrate over y first then x so the limits of integration must be values of x. What is the smallest x value in this region? That will be the lower limit. What is the largest x value in this region? That will be the upper limit.

The "inner" integral is with respect to y so the limits may be functions of x. Draw a vertical line on your graph representing some value of x. What is the y value of the lower end of that line? That is the lower limit on the integral. What is the y value on the upper end of that line (a function of x)? That is the upper limit on the integral.
 
Ok that is much more clear now. Thank you.
 

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