Question. Which of the following are rational functions?
f (x) = 0
f (x) = (3x-1) / (x^2-4x+5)
f (x) = e^x
f (x) = (sinx) / (cosx)
f (x) = -4x^-3+5x^-1+7-18x^2
f (x) = x^1/2 - x + 8
All polynomials can be thought of as rational functions.
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