Question $4$

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Videas ${?}^{-3}$

Given $L_n=\frac{6}{n}{\displaystyle \underset{n=1}{\overset{n}{}}}[(2+(i-1)\frac{6}{n}{)}^{4}sin(2+(i-1)\frac{6}{n})],$ express the limit as $n$ as a definite integral, that is provide $a,b$ and $f(x)$ in the expression ${\displaystyle \underset{a}{\overset{b}{}}}f(x)dx.$

$a=$

$b=f(x)=$