[tex]\bf \cfrac{\frac{a}{b}}{\frac{c}{{{ d}}}}\implies \cfrac{a}{b}\cdot \cfrac{{{ d}}}{c}\\\\
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\cfrac{\quad \frac{1}{2}\quad }{4}\implies \cfrac{\quad \frac{1}{2}\quad }{\frac{4}{1}}\implies \cfrac{1}{2}\cdot \cfrac{1}{4}\implies \cfrac{1\cdot 1}{2\cdot 4}\implies \cfrac{1}{8}[/tex]
