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\frac{\left(\sqrt{3}+1\right)\left(\sqrt{3}-1\right)}{2\times 2}
Multiply \frac{\sqrt{3}+1}{2} times \frac{\sqrt{3}-1}{2} by multiplying numerator times numerator and denominator times denominator.
\frac{\left(\sqrt{3}\right)^{2}-1^{2}}{2\times 2}
Consider \left(\sqrt{3}+1\right)\left(\sqrt{3}-1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{3-1^{2}}{2\times 2}
The square of \sqrt{3} is 3.
\frac{3-1}{2\times 2}
Calculate 1 to the power of 2 and get 1.
\frac{2}{2\times 2}
Subtract 1 from 3 to get 2.
\frac{2}{4}
Multiply 2 and 2 to get 4.
\frac{1}{2}
Reduce the fraction \frac{2}{4} to lowest terms by extracting and canceling out 2.