Question
$\left| {\,\begin{array}{*{20}{c}}{{1^2}}&{{2^2}}&{{3^2}}\\{{2^2}}&{{3^2}}&{{4^2}}\\{{3^2}}&{{4^2}}&{{5^2}}\end{array}\,} \right|$=
= $\left| {\,\begin{array}{*{20}{c}}1&4&9\\3&5&7\\5&7&9\end{array}\,} \right|$$ = 1(45 - 49) - 4\,(27 - 35) + 9\,(21 - 25)$
= $ - 4 + 32 - 36 = - 8$.
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$I$. $(0,1)$ में $f$ शून्य है.
$II$ $(0,1)$ में $f$ एकदिष $(monotone)$ है.तब