If we continue to raise the degree of our approximation we can continue to add conditions. For instance a third degree approximation P(x) = A + B(x – a) + C(x – a)² + D(x - a)³ can satisfy conditions (i), (ii) and (iii) as well as a fourth condition (iv) P''(a) = f''(a) 13) Find a third degree approximation of f (x) = sin x at x = ".
If we continue to raise the degree of our approximation we can continue to add conditions. For instance a third degree approximation P(x) = A + B(x – a) + C(x – a)² + D(x - a)³ can satisfy conditions (i), (ii) and (iii) as well as a fourth condition (iv) P''(a) = f''(a) 13) Find a third degree approximation of f (x) = sin x at x = ".
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Topic Video
Question
Can you solve these? Thank you!
![Page <
2
of 2
ZOOM
+
III. Higher Degree Approximations
If
we continue to raise the degree of our approximation we can continue to add conditions. For
– a) + C(x – a)² + D(x – a)³ can satisfy
instance a third degree approximation P(x) = A + B (x -
conditions (i), (ii) and (iii) as well as a fourth condition (iv) P''(a) = f''(a)
13) Find a third degree approximation of f (x) = sin x at x = -
6.
14) Derive formulas for A, B, C, and D for any third degree approximation of a function f(x)
centered at a.
In general we would like to find an nth-degree polynomial
T, (x) %3D со + c1 (х — а) + с2(х — а)2 + с3(х — а)3 + ..
+Cn(x – a)"
where T, and its first n derivatives have the same value at x = a as f and its first n derivatives.
T, (a) = f(®)(a)
(k)
T,(a) = f(a), Th(a) = f'(a), T"(a) = f"(a)
T(^) (a) = f(n) (a)
...
...
This polynomial is called the nth-degree Taylor polynomial of f centered at a. These will be
explored in further detail in Math 1C. For now we will just take a look at how these increasingly higher
degree approximations relate to each other and how they provide increasingly more accurate
approximations.
15) Find the 2nd, 4th, 6"™, and 8h degree Taylor polynomials for f(x)
= cos x centered at x = 0.
16) Use graph paper to provide a detailed and accurate graph of f, T2, T4, T6, and Tg on the same
graph with a domain of [-7, 1].
17) In questions (12) and (14) you found formulas for the coefficients of a second degree and a third
degree approximation (These are T2(x) and T3(x) respectively). Come up with a conjecture for the
formula for the kth coefficient of T (x).
п
18) Can you prove the conjecture you proposed in (17)?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8d2af6b8-35d3-4327-94c1-a05ff77beaf0%2Ff6683a42-c101-4222-8589-cf0b0a2beba9%2Fo8m8x3k_processed.png&w=3840&q=75)
Transcribed Image Text:Page <
2
of 2
ZOOM
+
III. Higher Degree Approximations
If
we continue to raise the degree of our approximation we can continue to add conditions. For
– a) + C(x – a)² + D(x – a)³ can satisfy
instance a third degree approximation P(x) = A + B (x -
conditions (i), (ii) and (iii) as well as a fourth condition (iv) P''(a) = f''(a)
13) Find a third degree approximation of f (x) = sin x at x = -
6.
14) Derive formulas for A, B, C, and D for any third degree approximation of a function f(x)
centered at a.
In general we would like to find an nth-degree polynomial
T, (x) %3D со + c1 (х — а) + с2(х — а)2 + с3(х — а)3 + ..
+Cn(x – a)"
where T, and its first n derivatives have the same value at x = a as f and its first n derivatives.
T, (a) = f(®)(a)
(k)
T,(a) = f(a), Th(a) = f'(a), T"(a) = f"(a)
T(^) (a) = f(n) (a)
...
...
This polynomial is called the nth-degree Taylor polynomial of f centered at a. These will be
explored in further detail in Math 1C. For now we will just take a look at how these increasingly higher
degree approximations relate to each other and how they provide increasingly more accurate
approximations.
15) Find the 2nd, 4th, 6"™, and 8h degree Taylor polynomials for f(x)
= cos x centered at x = 0.
16) Use graph paper to provide a detailed and accurate graph of f, T2, T4, T6, and Tg on the same
graph with a domain of [-7, 1].
17) In questions (12) and (14) you found formulas for the coefficients of a second degree and a third
degree approximation (These are T2(x) and T3(x) respectively). Come up with a conjecture for the
formula for the kth coefficient of T (x).
п
18) Can you prove the conjecture you proposed in (17)?
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