Question 3 5 pts 12 , The Fourier series for f(t) = ( t + 21) = f(t), te [-1, 7] is given by 2 + 4 Lin=1 Too (-1)" cos(nt) all t n2 . Substitute t = (smallest possible positive value rounded to the second decimal place) to evaluate En= = (round to third decimal place). . Parseval's identity can be written as,_ , f(t)2 dt = A + B En_] -. Give the values of A = (round to fourth decimal place), B = (integer) and C = (integer)