What is the 2 / 3 power of the formula x ^ 3 / 6 + O (x ^ 3),

x^3+o(x^3)=x^3(1+o(1))
So (x ^ 3 (1 + O (1))) ^ 2 / 3 = x ^ 2 (1 + O (1)) ^ 2 / 3 = x ^ 2 (1 + 2 / 3 * O (1)) = x ^ 2 (1 + O (1)) = x ^ 2 + O (x ^ 2)
The coefficient 1 / 6 is omitted here and can be added by oneself

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