Given the signal x(t) = 4cos (1001) cos(500t). what is its Fourier series representation? NOTE. If you use trigonometric identities, you don't have to solve any integrals. O x (1) 4cos (400r) + 4cos (6001) Ox(1) = 2cos (400r) + 2cos(6001) Ox(t) = 4cos (200r) + 4cos (3001) Ox(t) = 2cos (2001) + 2cos (300r) =

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