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a-f(x)=(x^2-4x+3)/(x-1)^3=(x-1)(x-3)/(x-1)^3

lim f(x) when x goes 1 =lim (x-3)/(x-1)^2 when x goes 1 =- inf

b- No

c- lim f(x) when x goes -1 =f(-1)=-1

d-we should have x+b=-1 when x=-1 so b=0

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