Determine the projection f(x) = 1 along sin(x), sin(3x)and find from there a function of the form 1 + c1 sin(x) + c3 sin(3x), which is perpendicular to both sin(x) and sin(3x). Explain why this combination is perpendicular to all functions in (8.1) for k = 5.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
icon
Related questions
Question
100%
Solve c part only in 30 min and take a thumb up
Consider the space of differentiable functions f: [0, 1] - R with the L 2 -inner product
(f. g) = 5n 0 f(x)g(x) dx.
(a)
Show that the collection consisting of the features
sin(x),sin(2x), ...,sin( (k - 1)x), (8.1)
defined for x € (0, n), are orthogonal for this inner product.
(b)
Explain that function f(x) = 1 is not perpendicular to sin(x) or to sin(3x), but is perpendicular
to sin(2x) and sin(4x).
(c)
Determine the projection f(x) = 1 along sin(x), sin(3x)and find from there a function of the
form 1 + c1 sin(x) + c3 sin(3x), which is perpendicular to both sin(x) and sin(3x). Explain why
this combination is perpendicular to all functions in (8.1) for k = 5.
(d)
For k = 5, determine in python the linear combination of functions in (8.1), which is closest to
the function
f(x) = 1 - e -x for 0< x <n.
Plot the function f(x) and its approximation.
Transcribed Image Text:Consider the space of differentiable functions f: [0, 1] - R with the L 2 -inner product (f. g) = 5n 0 f(x)g(x) dx. (a) Show that the collection consisting of the features sin(x),sin(2x), ...,sin( (k - 1)x), (8.1) defined for x € (0, n), are orthogonal for this inner product. (b) Explain that function f(x) = 1 is not perpendicular to sin(x) or to sin(3x), but is perpendicular to sin(2x) and sin(4x). (c) Determine the projection f(x) = 1 along sin(x), sin(3x)and find from there a function of the form 1 + c1 sin(x) + c3 sin(3x), which is perpendicular to both sin(x) and sin(3x). Explain why this combination is perpendicular to all functions in (8.1) for k = 5. (d) For k = 5, determine in python the linear combination of functions in (8.1), which is closest to the function f(x) = 1 - e -x for 0< x <n. Plot the function f(x) and its approximation.
Expert Solution
steps

Step by step

Solved in 6 steps with 5 images

Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:
9781133382119
Author:
Swokowski
Publisher:
Cengage