$$\tan ^ { - 1 } ( \tan 3 \pi / 5 )$$
$\frac{25000000000000000}{1599906710110601}\approx 15.625911087$
$$0.06399626840442404 ^ {-1}$$
$$\frac{25000000000000000}{1599906710110601}$$
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$\frac{2 ^ {15} \cdot 5 ^ {17}}{8293 \cdot 11519 \cdot 16748203} = 15\frac{1001399348340985}{1599906710110601} = 15.625911087198178$
