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Consider the analog signal $$x(t) = 3 \cos 100 \pi t$$. If the signal is sampled at 200 Hz,the discrete time signal obtained will be
$$3 \cos(\frac{\pi n }{4})$$
$$3 \cos(\frac{\pi n }{2})$$
$$3 \cos(\pi n)$$
$$3 \cos(\frac{\pi n }{3})$$
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