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Expand (1+x)^(2//3) up to four terms for...

Expand `(1+x)^(2//3)` up to four terms for `|x| lt 1`.

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The correct Answer is:
Thus, `(1+x)^(2//3)= 1+2/3 x - 1/9 x^(2)+(4)/(81) x^(3)+...`
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