Answer
$\huge \frac{(\frac{a}{b})}{2}=\frac{a}{2b}$
Work Step by Step
Lets just ignore $\large\frac{a}{b}$ for now by calling it $x$.
$\large \frac{\color{blue}{\large\frac{a}{b}}}{2}$
$\color{blue}{\large\frac{a}{b} = x}$
$\large\frac{\color{blue}{x}}{2} = \color{blue}{x} * \frac{1}{2} $
$\large \color{blue}{\large\frac{a}{b}} * \frac{1}{2} $
$\large \frac {(a*1)}{(b*2)}$
Our answer is:
$\huge\frac{a}{2b}$