## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$\displaystyle \frac{1}{9}$
Apply rule $\quad a^{m}\cdot a^{n}=a^{m+n}$: $3^{-6}\cdot 3^{4}=3^{-6+4}=3^{-2}$ Apply rule $\displaystyle \quad a^{-n}=\frac{1}{a^{n}}$: $=\displaystyle \frac{1}{3^{2}}$ $=\displaystyle \frac{1}{9}$