- #1
Marcus95
- 50
- 2
Homework Statement
Let ## f(x) = \frac{a_0}{2} + \sum_{n=1}^{\infty} (a_n \cos nx + b_n \sin nx) ##
What can be said about the coefficients ##a_n## and ##b_n## in the following cases?
a) f(x) = f(-x)
b) f(x) = - f(-x)
c) f(x) = f(π/2+x)
d) f(x) = f(π/2-x)
e) f(x) = f(2x)
f) f(x) = f(-x) = f(π/2-x)
Homework Equations
Sine is odd and cosine is even. Even functions can only contain cosine terms and odd functions only sine terms in their Fourier Series.
The Attempt at a Solution
Here is how far I have gotten:
a) All b=0 because even function
b) All a=0 because odd function
c) Funtion has period π/2 (?)
d) Funtion has period π/2-2x (?)
e) Function has period x (not neccessarily the shortest period)
f) All b=0 because even function.
But here I am stuck, because I have no idea how to relate the coefficients to the period in c)-f), and in c)-e) I don't know if the funtion is odd or even.
Many thanks for any help! :)