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Find the coefficient of x^(3) in the pow...

Find the coefficient of `x^(3)` in the power series expansion of `(5x+6)/((x+2)(1-x))` specifying the region in which the expansion is valid.

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The correct Answer is:
`:."Coefficient of "x^(3)=-(2)/(3)(-(1)/(8))+(11)/(3)(1)=(2+88)/(24)=(90)/(24)=(15)/(4)`
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