87 The plot of a time-domain function shows tiro palses of a periodic, repeating wareform fit) t (a) The wav efcem is to be represented by a Fourier series. What are the ferst three nonzero Fourier series terms (A) 2 cos(0.5mt) + 2 sin(nt) + _ sin(1.5mt) (B) 0.5 + 2 sin(0.5rt)_sin(1.5m) (C) 0.5 + 2 cos(0.5nt) + sin(1.5nt) (D) _ sin(0.brt) + _ s_1.5nt)_sin(2.5nt) 3T The graph shows a pulse in a communications signal. xlt) 1 t (s) What is the Fourier transform of the pulse? (A) sinc? (B) 2 sine 2f (C) 2 sinef (D) 2 sine2 2r
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