1. Iterated Integrals 2. Change of order of Integration 3. Area enclosed by plane curves 4. Change of variables in double integrals 5. Triple Integrals
UNIT
‒ IV
MULTIPLE
INTEGRALS
Let f(x,y) be a continuous function of x and
y defined within and on a region R bounded by a closed curve C in the xy‒plane
shown in the Figure 5.1. Let this region R be divided into n sub rectangles of areas δA1, δA2, ..., δAn.
Let (xr, yr) be any point inside the rth
rectangle of areas δAr.
Consider the sum f(x1,y1)δA1
+ f(x2, y2)δA2
+ ... + f(xn, yn)δAn
= Σr=1n f(xr,yr)δAr.
The limit of this sum, as n→ ∞ and δAr → 0, r = 1,2,....n is defined
as the double integral of f(x, y)
over the region R and is written as ∫∫R f(x, y)dA.
In other words

Applied Calculus: UNIT IV: Multiple Integrals : Tag: Applied Calculus : - Multiple Integrals: Introduction
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