Simplify $\left(\left(a^3\right)^{\left(a+2\right)}\right)^a$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $a+2$ and $n$ equals $a$

Simplify $\left(a^3\right)^{\left(a+2\right)a}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $3$ and $n$ equals $\left(a+2\right)a$