EXAMPLE 2 Using the change of variables x = u? - v?, y= 10uv to evaluate the integral SSay dA, where R is the region bounded by the x-axis and the parabolas y? = 10 - 10x and y? 10 + 10x, y 2 0. SOLUTION A similar region R is pictured in the figure. In Example 1, we discovered that 7(S) = R, where S is the square [0, 1) x [0, 1). Indeed, the reason for making the change of variables to evaluate the integral is that S is a much simpler region than R. First we need to compute the Jacobian: ax ax a(x, y). a(u, v) du av ay ay du av 2u -2v 10v Therefore by the theorem for the change of variables in a double integral acx, v) 10uv dA a(u, v) )du dv - 200 I (wv + uv*)du dv - 200 - 200 )dv - 200
Optimization
Optimization comes from the same root as "optimal". "Optimal" means the highest. When you do the optimization process, that is when you are "making it best" to maximize everything and to achieve optimal results, a set of parameters is the base for the selection of the best element for a given system.
Integration
Integration means to sum the things. In mathematics, it is the branch of Calculus which is used to find the area under the curve. The operation subtraction is the inverse of addition, division is the inverse of multiplication. In the same way, integration and differentiation are inverse operators. Differential equations give a relation between a function and its derivative.
Application of Integration
In mathematics, the process of integration is used to compute complex area related problems. With the application of integration, solving area related problems, whether they are a curve, or a curve between lines, can be done easily.
Volume
In mathematics, we describe the term volume as a quantity that can express the total space that an object occupies at any point in time. Usually, volumes can only be calculated for 3-dimensional objects. By 3-dimensional or 3D objects, we mean objects that have length, breadth, and height (or depth).
Area
Area refers to the amount of space a figure encloses and the number of square units that cover a shape. It is two-dimensional and is measured in square units.
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EXAMPLE 2 Using the change of variables x = u2 - v2, y = 10uv to evaluate the integral SSRY dA, where R is the region bounded by the x-axis and the
(2. 21
parabolas y2 = 10 - 10x and y? = 10 + 10x, y 2 0.
-1,1)
a,1)
SOLUTION
A similar region R is pictured in the figure. In Example 1, we discovered that T(S) = R, where S is the square [0, 1] x [0, 1]. Indeed, the
reason for making the change of variables to evaluate the integral is that S is a much simpler region than R. First we need to compute the Jacobian:
ax
a(x, Y) =
a(u, v)
ax
du
av
ay ay
au av
2u
-2v
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x-y-2
10v
20
Video Example 4)
Therefore by the theorem for the change of variables in a double integral
acx, y)
a(u, v)
y dA
dA
)du dv
7 wv + uv³)du dv
= 200
= 200
= 200
)dv
= 200
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