Identifying Horizontal Asymptotes (3 Rules)

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Find the horizontal asymptote of the graph of each rational function or state that one does not exist.

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