Help with Fourier Series Problems - 1,2,3

[date.chinmay]

hey guys need some basic help in Fourier series..
these are a couple of problems i got stuck at...

1. f(x) = 50 -8<x<-2
= 0 -2<= x<= 4


2. f(x) =Sin x 0<x<= pi
= 0 pi <= x<= 2pi

3. f(x) = 0 0<x<1
= 1 1<= x<= 2

please help guys/..

 

[susskind_leon]

What have you tried so far?
Do you recognize that 1. and 3. are essentially the Heaviside Step-function?