What is smallest frequency that can be used by signals

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What is the smallest frequency that can be used to sample each of the following continuous-time signals such that the signal can be recovered from the discrete samples?

(a) \(x(t)=1+cos(2000\pi t)+cos(4000\pi t)\)

(b) \(x(t)=sin(4000\pi t)/\pi t\)

(c) \(x(t)=((sin(4000\pi t)/(\pi t))*cos(2000\pi t)\)

Reference no: EM13254454

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