Power series expansion up to quintic term

Expand $(1 + 3x^2 - 6x^3)^{- rac{2}{3}}$ as far as $x^{5}$ .

~12 minAnswer checked instantlyBinomial TheoremPower Series

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XV. Multinomial Theorem, Examples XV, No. 17

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).