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4. For each of the given function i. Sketch the graph of y = f(x). ii. Determine if the function is even, odd or neither. iii. Then, find the Fourier series of f(x). a. f(x)= ; f(x) = f(x+2π). 2. -<x<0 -2, 0<x<* b. f(x) = { -*<x<0 I, π <I<2m -1. (0, c. f(x) = {4, d. f(x)=x², ; f(x) = f(x + 2x). -<<0 0<x<= f(x) = f(x+2x). -1<x<1; f(x) = f(x+2).