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Expand (1+x)^-2....

Expand `(1+x)^-2`.

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`(1+x)^-2=1+(-2)x+((-2)(-2-1)x^2)/(|__2)+((-2)(-2-1)(-2-2)x^3)/(|__3)=1-2x+3x^2-4x^3`
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