#1553 · Algebra · Sequences & series
Power series expansion up to quadratic term
Expand (1 - 2x - 2x^2)^{ rac{1}{4}} as far as .
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XV. Multinomial Theorem, Examples XV, No. 16
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).