Which of the following is a rational function

a. f (x) = 0

b. f (x) = (3x+1) / (x^2-4x+5)

c. f (x) = e^x

d. f (x) = sinx/cosx

e. f (x) = -4x^-3+5x^-1+7-18x^2

f. f (x) = x^ (1/2) - x+8

g. f (x) = x^ (1/2) / x^3-x

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