3. A 2x-periodic function f(x) is defined on -7

3. A Y-periodic function is defined on T < :r < by, (a) Obtain a mjurier series for f ('.r). (b) Use thc Fourier scries from 3a in Parseval's theorem to prove that, (2n 96 (c) By differentiating thc series in 3a, obtain a Follrier series expansion of thc periodic sqllarc wave, Check thc validity of y011r result by determining directly thc Furicr scries expansion of