16. Use the De Moivre formulas (11) to derive the standard formulas for cos (0 + 6) and sin (0 + ø). THE COMPLEX FORM OF THE FULL FOURIER SERIES The eigenfunctions of -d²/dx² on (-1, 1) with the periodic boundary conditions are sin(nлx/l) and cos(nëx/l). But recall the DeMoivre formulas, which express the sine and cosine in terms of the complex exponentials: eie -i0 - e ei te -i0 sin 0 and cos 0: = 2i 2 (11)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
icon
Related questions
Question

Could you please help me out solving question 16? I don't know how to do it. I have also attched what the question asks to use.  

16. Use the De Moivre formulas (11) to derive the standard formulas for cos (0 + 6) and sin (0 + ø).
Transcribed Image Text:16. Use the De Moivre formulas (11) to derive the standard formulas for cos (0 + 6) and sin (0 + ø).
THE COMPLEX FORM OF THE FULL FOURIER SERIES
The eigenfunctions of -d²/dx² on (-1, 1) with the periodic boundary conditions are sin(nлx/l) and
cos(nëx/l). But recall the DeMoivre formulas, which express the sine and cosine in terms of the
complex exponentials:
eie
-i0
- e
ei te
-i0
sin 0
and cos 0:
=
2i
2
(11)
Transcribed Image Text:THE COMPLEX FORM OF THE FULL FOURIER SERIES The eigenfunctions of -d²/dx² on (-1, 1) with the periodic boundary conditions are sin(nлx/l) and cos(nëx/l). But recall the DeMoivre formulas, which express the sine and cosine in terms of the complex exponentials: eie -i0 - e ei te -i0 sin 0 and cos 0: = 2i 2 (11)
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Recommended textbooks for you
Advanced Engineering Mathematics
Advanced Engineering Mathematics
Advanced Math
ISBN:
9780470458365
Author:
Erwin Kreyszig
Publisher:
Wiley, John & Sons, Incorporated
Numerical Methods for Engineers
Numerical Methods for Engineers
Advanced Math
ISBN:
9780073397924
Author:
Steven C. Chapra Dr., Raymond P. Canale
Publisher:
McGraw-Hill Education
Introductory Mathematics for Engineering Applicat…
Introductory Mathematics for Engineering Applicat…
Advanced Math
ISBN:
9781118141809
Author:
Nathan Klingbeil
Publisher:
WILEY
Mathematics For Machine Technology
Mathematics For Machine Technology
Advanced Math
ISBN:
9781337798310
Author:
Peterson, John.
Publisher:
Cengage Learning,
Basic Technical Mathematics
Basic Technical Mathematics
Advanced Math
ISBN:
9780134437705
Author:
Washington
Publisher:
PEARSON
Topology
Topology
Advanced Math
ISBN:
9780134689517
Author:
Munkres, James R.
Publisher:
Pearson,