Evaluate the expression
1
2
a
2
b
\displaystyle \frac{{1}}{{2}}{a}^{{2}}{b}
2
1
a
2
b
for
a
=
2
7
,
b
=
1
2
\displaystyle {a}=\frac{{2}}{{7}},{b}=\frac{{1}}{{2}}
a
=
7
2
,
b
=
2
1
.
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