$1\mathrm{.}22)f(n)$ and $g(n)$ are real, causal, and stalle sequenles with Four:le transterens $F(e^j)$ and $G(e^j),$ respertively. Show that

$\frac{1}{2}{\displaystyle \underset{-T}{\overset{}{}}}F(e^j)G(e^j)d=\{\frac{1}{2}{\displaystyle \underset{-}{\overset{}{}}}F(e^j)d\}\{\frac{1}{2}{\displaystyle \underset{-}{\overset{}{}}}G(e^j)d\}$