a. Express 7x - 1/(1 - x)(1 + 2x) in partial fractions. b. Hence obtain the expansion

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a. Express 7x - 1/(1 - x)(1 + 2x) in partial fractions.

b. Hence obtain the expansion of 7x - 1/(1 - x)(1 + 2x) in ascending powers of x, up to and including the term in x3.

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