Some mathematical operations whose result is \(\frac{1}{2}\):

- \(\cos 60º = \frac{1}{2}\);
- \(\frac{\cos 30º}{\sqrt 3}=\frac{1}{2}\);
- \(\frac{1}{3}+\frac{1}{6}=\frac{1}{2}\).

Using all the digits from \(1\) to \(9\):

- \(\frac{6,729}{13,458}=\frac{1}{2}\).

Using the same number twice but changing the position of one digit:

- \(\frac{105,263,157,894,736,842}{210,526,315,789,473,684}=\frac{1}{2}\).

Numbers with such property are called parasitic numbers.

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