Ans: $\dfrac{x^{57}}{y^6}$
$\begin{array}{cl}
& \dfrac{x^{65}}{(x^4y^3)^2} \\
= & \dfrac{x^{65}}{x^8y^6} \\
= & \dfrac{x^{57}}{y^6}
\end{array}$
$\begin{array}{cl}
& \dfrac{x^{65}}{(x^4y^3)^2} \\
= & \dfrac{x^{65}}{x^8y^6} \\
= & \dfrac{x^{57}}{y^6}
\end{array}$
