Math Problem Statement

Change the order of integration, evaluate the given double and triple integrals, and find the area between a cardioid and a circle.

Solution

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Question 1: (a) Change the order of integration
01x2x2xx2+y2dydx\int_0^1 \int_x^{\sqrt{2 - x^2}} \frac{x}{\sqrt{x^2 + y^2}} \, dy \, dx
and hence evaluate. (8 Marks)

(b) Find the area lying inside the cardioid r=a(1+cosθ)r = a(1 + \cos\theta) and outside the circle r=ar = a. (7 Marks)


Question 2: (a) Change the integral
0204x2(x2y+y3)dydx\int_0^2 \int_0^{\sqrt{4 - x^2}} (x^2 y + y^3) \, dy \, dx
into polar coordinates and hence evaluate. (8 Marks)

(b) Evaluate
0ln(8)02xx+ln(8)ex+y+zdzdydx\int_0^{\ln(8)} \int_0^2 \int_x^{x + \ln(8)} e^{x + y + z} \, dz \, dy \, dx
(7 Marks)


Would you like to start solving these questions one by one, or focus on a specific part? Let me know!

Here are 5 relevant questions to expand understanding:

  1. How do you approach the transformation of integration order in double integrals?
  2. What is the significance of polar coordinates in evaluating double integrals?
  3. How do you find areas enclosed by curves in polar coordinates?
  4. What is the role of symmetry in simplifying integrals involving circular regions?
  5. How do you interpret and simplify triple integrals with exponential functions?

Tip: Visualizing the region of integration using graphs helps significantly when changing the order of integration or converting to polar coordinates.

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Math Problem Analysis

Mathematical Concepts

Double Integrals
Triple Integrals
Polar Coordinates
Order of Integration
Area Calculation in Polar Coordinates

Formulas

Double integral order transformation
Triple integral evaluation
Conversion to polar coordinates: x = rcosθ, y = rsinθ
Area element in polar form: dA = r dr dθ

Theorems

Fubini’s Theorem
Change of Variables Theorem
Polar Area Formula

Suitable Grade Level

Undergraduate (Calculus II or III)