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Let the signal r(t) be periodic with period T = 4 and given by = Seit X(t) = -1<t<1 |t| > 1 0 = = = ak = - in the interval -2 <t< 2. What are the Fourier coefficients of r(t)? o ai = 1, ak = 0, k + 1. O a-1 = 1, ak = 0, k = -1. + sin(1 – km) 2 - KT cos(1 – k) O ak = 2 – k sin(2 – kn) ak = 2 – KT cos(2 – kn) I ak = 2 – ka