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{\plain {\b Hint}{ Start with the definition
of H1(}{\f1 w}{) in terms of the FIR h}{\fs16
\dn6 m}{ and then use the inverse of (10.3)
to represent h}{\fs16 \dn6 m}{ in terms
of the frequency samples H}{\fs16 \dn6
k}{. An interchange of order of summation
and use of the known sum of a geometric
series gives the result.}}
}