The document discusses the Fundamental Theorem of Calculus, which states that differentiation and integration are inverse operations. It explains that the theorem connects the two major branches of calculus - differential and integral calculus. The theorem also shows that the net change in an accumulation function F(x) over an interval [a,b] is equal to the definite integral of F'(x) from a to b. In other words, it connects the integral and derivative of a function.
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2. 2
SUBJECT :REAL ANALYSIS
TOPIC :FUNDAMENTAL
THEOREM OF CALCULUS
SUBMITTED TO SUBMITTED BY
(Dr. RIMPLE PUNDIR) (DEEPAK KUMAR)
3. 3
The Fundamental Theorem of Calculus
I have now been introduced to the two major branches of
calculus: differential calculus and integral calculus. At this
point, these two problems might seem unrelated—but there
is a very close connection.
The connection was discovered independently by Isaac
Newton and Gottfried Leibniz and is stated in the
Fundamental Theorem of Calculus.
4. 4
Informally, the theorem states that differentiation and
(definite) integration are inverse operations, in the same
sense that division and multiplication are inverse
operations. To see how Newton and Leibniz might have
anticipated this relationship, consider the approximations
shown in Figure 4.27.
Figure 4.27
The Fundamental Theorem of Calculus
5. 5
The Fundamental Theorem of Calculus
The slope of the tangent line was defined using the
quotient Δy/Δx (the slope of the secant line).
Similarly, the area of a region under a curve was defined
using the product ΔyΔx (the area of a rectangle).
So, at least in the primitive approximation stage, the
operations of differentiation and definite integration appear
to have an inverse relationship in the same sense that
division and multiplication are inverse operations.
The Fundamental Theorem of Calculus states that the limit
processes (used to define the derivative and definite
integral) preserve this inverse relationship.
7. 7
The Fundamental Theorem of Calculus
The following guidelines can help you understand the use
of the Fundamental Theorem of Calculus.
8. 8
The Mean Value Theorem for Integrals
You saw that the area of a region under a curve is greater
than the area of an inscribed rectangle and less than the
area of a circumscribed rectangle. The Mean Value
Theorem for Integrals states that somewhere “between” the
inscribed and circumscribed rectangles there is a rectangle
whose area is precisely equal to the area of the region
under the curve, as shown in Figure 4.30.
Figure 4.30
9. 9
The value of f(c) given in the Mean Value Theorem for
Integrals is called the average value of f on the
interval [a, b].
Average Value of a Function
10. 10
Earlier you saw that the definite integral of f on the interval
[a, b] was defined using the constant b as the upper limit of
integration and x as the variable of integration.
However, a slightly different situation may arise in which
the variable x is used in the upper limit of integration.
To avoid the confusion of using x in two different ways, t is
temporarily used as the variable of integration. (Remember
that the definite integral is not a function of its variable of
integration.)
The Second Fundamental Theorem of Calculus
12. 12
You can think of the function F(x) as accumulating the area
under the curve f(t) = cos t from t = 0 to t = x.
For x = 0, the area is 0 and F(0) = 0. For x = π/2, F(π/2) = 1
gives the accumulated area under the cosine curve on the
entire interval [0, π/2].
This interpretation of an integral as an accumulation
function is used often in applications of integration.
The Second Fundamental Theorem of Calculus
13. 13
Note that the derivative of F is the original integrand (with
only the variable changed). That is,
This result is generalized in the following theorem, called
the Second Fundamental Theorem of Calculus.
The Second Fundamental Theorem of Calculus
14. 14
Using the area model for definite integrals, you can view
the approximation
can be viewed as saying that the area of the rectangle of
height f(x) and width Δx is approximately equal to the area
of the region lying between the graph of f and the x-axis on
the interval [x, x + Δx], as shown in the figure below.
The Second Fundamental Theorem of Calculus
15. 15
Net Change Theorem
The Fundamental Theorem of Calculus states that if f is
continuous on the closed interval [a, b] and F is an
antiderivative of f on [a, b], then
But because F'(x) = f(x), this statement can be rewritten as
where the quantity F(b) – F(a) represents the net change of
F on the interval [a, b].
17. 17
Net Change Theorem
Another way to illustrate the Net Change Theorem is to
examine the velocity of a particle moving along a straight
line where s(t) is the position at time t. Then its velocity is
v(t) = s'(t) and
This definite integral represents the net change in position,
or displacement, of the particle.
18. 18
Net Change Theorem
When calculating the total distance traveled by the particle,
you must consider the intervals where v(t) ≤ 0 and the
intervals where v(t) ≥ 0.
When v(t) ≤ 0, the particle moves to the left, and when
v(t) ≥ 0, the particle moves to the right.
To calculate the total distance traveled, integrate the
absolute value of velocity |v(t)|.
19. 19
Net Change Theorem
So, the displacement of a particle and the total distance
traveled by a particle over [a, b] is
and the total distance traveled by the particle on [a, b] is
(see Figure 4.36).
Figure 4.36
20. 20
References :-
• Real analysis ( Dr. Sudhir Kumar Pundir)
Published by : pragati Publishers &
Distributers pvt ltd.
• University books (M.Sc. Level)
• Internet sources (google, Wikipedia , etc.)