$$( \frac { 1 } { 8 } ) ^ { 2 / 5 } + \frac { 1 } { 12 } ]$$
$\frac{2^{\frac{4}{5}}}{4}+\frac{1}{12}\approx 0.518608615$
$\frac{3 \cdot 2 ^ {\frac{4}{5}} + 1}{12} = 0.5186086149813954$
