To do this, we need to find a common denominator for the fractions. The common denominator for 1/2 and 1/4 is 4. So, we rewrite 1/2 as 2/4. The expression becomes:
$$\left(\frac{2}{4}-\frac{1}{4}\right)\left(\frac{2}{4}-\frac{3}{4}\right)$$
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