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Unknown macro: {latex}
\large
$$
f = {{0.25} \over {\log \left( {{\varepsilon \over {3.7 \cdot 4 \cdot R_h }} + 5.74 \cdot ({\mathop
Unknown macro: {rm Re}
\nolimits} ^
Unknown macro: { - 1}
)^
Unknown macro: {0.9}
} \right)^2 }}
$$