Simplify: a9b12a3b4\frac{a^9 b^{12}}{a^3 b^4}a3b4a9b12
a6b8a^6 b^8a6b8
a12b16a^{12} b^{16}a12b16
a3b3a^3 b^3a3b3
a6b12a^6 b^{12}a6b12