what are the two smallest positive values of K for which g [n] = h [n] for all n?
If g [n] = 15 cos (?2?n/12) and h [n] = 15 cos (2?Kn)
If and what are the two
smallest positive values of K for which for all n?
because it is an even function. Therefore works. Since this is a discrete-time function adding 1 to or subtracting 1 from the fundamental discrete-time frequency does not change the function values. The fundamental frequency is . Therefore changing the frequency to 13/12 would yield the same function values. But changing it to would also yield the same values and, because the function is even, also works.
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