Q3: The modulating signal f(t) = 2 cos 100 at + cos 400t is applied at the input of a DSB/ SC modulator operating at a carrier frequency of 1 kHz. Sketch the spectral density of f(t) and the resulting...

Extracted text: Q3: The modulating signal f(t) = 2 cos 100 at + cos 400t is applied at the input of a DSB/ SC modulator operating at a carrier frequency of 1 kHz. Sketch the spectral density of f(t) and the resulting AM-DSB/SC waveform identifying the upper and lower sidebands.