>>11673219>>11673219You're working on a book that assumes that you already know fourier series. Apparently you don't.
What does the exercise consist of?
Simply form the fourier series of the function f. That actually means finding the coefficient a.n You get the coefficient a.n of the fourier series by multiplying f(?) with cos(2*pi*?*n/L) and integrating for ? with boundaries 0 to L. The result is multiplied with 2/L again. You will notice that cos(2*pi*?*n/L) can also be expressed in terms of a complex euler function. Do this to realize that all terms of f(?) disappear except for when a.m of f(?) is equal to a.n. You will see that you're actually multiplying all a coefficients of f(?) with cos(2*pi*?*n/L)
