$$5 \cos 5$$
$4.9809734904587275$
$$5 \cdot 0.9961946980917455$$
$$4.9809734904587275$$
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$\frac{271 \cdot 499 \cdot 12503 \cdot 1178393}{2 ^ {16} \cdot 5 ^ {14}} = 4\frac{392389396183491}{400000000000000} = 4.9809734904587275$
